1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f0b9a1efa4ebeb94cf46af11febeafdf36aee221a9addffad24ad0987e9a8c. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/288240b9-2804-4466-a618-7d21e7d56980.json and https://artists.proofprofile.net/proofs/artist/288240b9-2804-4466-a618-7d21e7d56980.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6b1db7d71345436ee73d3e8f53e6e2ba8f7ece1ca8ccc10b169747d90503ee. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:17:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR26V2005781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef9f3dc9ba43205f5664ff1c6f28d39e09214d78412da1df8a994637d2e8d56. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NL8RL2417857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4aaf994fe4c917f1523cd678f0adabdf20f35d4b133c8803d88c0f514994157. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732022280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7f7d5483147f698253189c7aa35dff1c236f699154a7ce9aee4c50397f0ef0. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NL8RL2417654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0dad925198be94097affab04741dcb73c899c8b724d515f7804c1e7dbb9d5ec. Chain 2 (Bitcoin): anchored in block 956405 (2026-07-17T02:45:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA072132082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4120ef51725c7a6fd4ec6dd2638c0cb6a3b17feebb1fc6e09008c69deff053e2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732118634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b03c376696501e652ce685b1d09f545f5e9a9d26fad2f2fcb895638b66a5a68. Chain 2 (Bitcoin): anchored in block 956405 (2026-07-02T22:22:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNZ632100417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1c69c39aa01b468fd071edd63a724571fdd48baff68125de8fdddc6af15b38. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NL8RL2417645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf6962382faed577e03e238bdf721f19ec7a6281168420a3b735314f85e233a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:06:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG731541963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c84068f6b8e9aea9114731ce9cebba00804440943ab102770adb6d67dddfac. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG731713326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3e306d8aeda8d2f2efd6c78b75892eec6d2078e0e35e59f29f969df193a4c7. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TWDL72202176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f156199902b91a244a0f649557cf6b66d164ec12b0d6762e4d6dc8f678f555. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX872394061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7504db1c3deee397cb29544ba25879da27762e4ec0d1f5a0d54a46b1a29f02. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX452330835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6b73491e55d09d8ddf6413e564698c40edd7100f25c9e6be2ff7d38d8ea59c. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNZ632300688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c75bea114fd8398b8770e98a04f246216e09f28b4240e364fdef3b4e07cb60. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NL8RL2417652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b6816e0fb58990c9f8819b6fffb35e71dfa46486c8ee6c870ac18824ee1488. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNZ632301365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc518b934cab52144c5760ade5b4901774f91aeb42506368f19a7d62f0d398fc1. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:06:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNZ632401273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c029f0d1877e2aa54c2adf6b07430b11e635bf482b6a1b530497bc37082aac9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NL8RL2451962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b6b178080d1f67ecc74b708194568512ce53f370fdab2a700d8b8d0d8930b0. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12402742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde97fc68ce26277e4877500d39fdf597f61246d0c2b57a08018c04ffc0bab102. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12402800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917a31d2693d601706b3df9f5f5a8ff7aa3dac4dac736b8ea2b795ff39dc3cec. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12403791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c83b17a5da6f6ee661e4c7a76967a8d2987452013f833b1125d2b701e6782b9. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12403653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4550e7e0f88bd58539cf86cc6b8420e7e75c80a2cb62469c98a3f48139d17d5. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12401335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e08e2c74c0058530739bc494933f71f9368eedd4c35753fbc227c6b5f0fc690. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12403654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0089c5eeb3ba12864bb9f420652852457a02f319367a4c5d6b163936e453fb. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:20:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12401268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4f21afea7a07dd4042ed7eafc06cf19acc1afd31fbe0092e7f34f86ef8f492. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12403641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0beb7524624de228e7ab2432ea6f7901bf615fa654759dd91a9cc1422390f1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12403585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8657e6c50a15184362f5e16a95669b1a7f8f94de5e8db8904f0576393fd6a836. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12403892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35478213f78deac6fdbbb33db936cc313415e2fc488abf40003958ae775db63e. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T11:01:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QNSM12403893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9601536c7ce83ddfa74911a8c26eec42dcb1d209a16bc21f2f1c11de86d71d7d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2502548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb151de93c4efc536760335536fa40c24d2e59e38eb0b6373c2088805ab8452. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T08:05:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2502907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2e7f0ff7ce000d120aa41133ad46548bd3383c7781830a42f16cf382d984c6. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2502987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ae2051d6430fc383a5c6a4cda0c1be8da589c5b6bd6023c2767b0346afe3a3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2504091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eef00f9fe61c11a92311746cd574d57b488a0c8eed55035c53e271f83a0dfe1. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T14:03:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2505170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01064e543481632f919615db2744977dc5526bb5bdf9440aad04dec61cb7eda2. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T09:47:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2505104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119d187b577f9fdc784143781d37be87e5a5b8199eb37767b7974fc06c74b5b5. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2506154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119d187b577f9fdc784143781d37be87e5a5b8199eb37767b7974fc06c74b5b5. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2506154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9fc325d122e3a8cb0a4dc9d49a34e6a670c9a0e36b37f259da0c596c157dc9. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T10:43:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CN2DY2506971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad75538e8f83f05e2c5b34a3d765a2f6fe79b0545e70ce93718a10c55af8ce7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732381656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1327d400a69853eee7cd024d79b8820c469359700503bc8c8fc09d08adf9923. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKD012301184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04abe2aefacbad2f71639288b5afb79bebe98073632985522d1294087f450d45. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732488638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d27799b4f1d10a1bce85831bf37e15fb5c019871bbc25dce9a26a245ad9f39. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA092374774.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch