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 0x0f629e7cd49dda92a37746dfd32cfd9a473c2312317a38d5a6a1c266d08697a3. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c093d8a3-2b7f-48aa-8592-97a0add837b6.json and https://artists.proofprofile.net/proofs/artist/c093d8a3-2b7f-48aa-8592-97a0add837b6.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 0x21583717a1fe78cf101a1e010a98b86603596afb14d7f9eee0c6ec59adee7f88. 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/QZK6P2167775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fef477385f9ea55dabeab90ccb717fdbee0ac9f0ad19726cb4e984c97e2f5a8. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZK6P2169473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cad0dec3b68809b0858e62637701c089addc2306996260650f13263da1ab34b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6G2118090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031737ed4d61e18fe090f5528841040c64500081bc5356a8c1df3866d2ec41ab. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:40:47Z), 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/QZNWT2196664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0ddadf46147b922af63540e6dbacb2dbf134bbb708df21225437f81b7c5890. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZPLR2188920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0714b59a16e838ce7fc9f37814fa640874518ff8b943251f639ec9d90015c6b. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T11:01:16Z), 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/QZPLR2188922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c7227b919e3b3cd1299700bb765fb6c3b53e4507c270b1697d5815c83c1fd8. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZHN72275161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800f7db4176c259ec73bf6dd536a7ae7de5c5bd0bc820edcd8d78d3433582afd. 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/QZHN82275224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26c07a1d6367cfade8b4810b35b6f7938785be84f5c5fef37fd01ce2372f86d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZMEQ2233602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff850aeea392eb33645952af30acc8340d417a114a8f5d87428fba012cbc7a9. 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/QZNWT2259225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316c1b3535721bd565f7115720fbd0cd9173581439f18d4d47782b9e422caac5. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNWT2277607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8541a2ac1c28d061400ceef4e8d84d8e2ae36e2b58146f34d9f868b199207856. 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/QZNWT2277801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217ac59904622f31de344e724261d3c8b9aee9c6a18b4675e0f8bee778d6cdad. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZRP52248994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b14e7a3af66a4cd1c8a88da6ca8de15ba0ee41bd57c51910a57a86ed18463f1. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZRP52277335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee1c01e1628acd2b96ef766053991b55ad27e39a8d27f70c96cd1af50446945. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:04:35Z), 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/QZTAS2244191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a5a64a981bd075981e4e62567a64072ce1aad3f832b7d1f7dd6e328e381b78. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:18:28Z), 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/QZRP52277334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93480d48d2617df795a0de6e27b709a3d7f163df7298e5e42a41f26845a3ad2e. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZRP52277336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eee831239b189fbe9b9b5dfb777767aa022e65a601ee439268602926a2705c9. 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/QZMER2297100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08e4e5b9c322129d25804ee5ab1349b6321d4cc1cac729950273892e478c152. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZNWR2266442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4fd910e1bcb4e7688a72aa37b3f16387c67210590d75ae9b1f45b51b97ac46. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:24:03Z), 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/QZTB72268257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754f64b8e057b55da19485ee31fc072c1648a9d78079e88fd8a4a3b117027330. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:08:26Z), 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/QZFZ72381124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1859b3d3dee237d6772ff9f7e25c642fdbe1fe00feb1c35d70e456302e60e6ed. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T09:57:12Z), 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/QZFYX2331472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58903634c5c1bd5b37f317340b63efdb21148663d474b8ee118a484698ef9793. 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/QZNJV2320139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ff3f7981147dbcec7db4503a9a09518281550325eefc9f0fb84b3a4e2d91fa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNJW2308264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d23e139151cb2a4ec862f0cd70266a87052629192565565fa13a6149bbc2a32. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZNJY2318554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10612b67391134b8481f57455ed1817bb71630c6025f2d0569160ab7d20a959d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNJW2386506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3127644ae0c0aaeb1a451f82b604d97d2c7099dcfa7798cd828cd0bab08728. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNJY2352876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11040853430608e2050bfccf6efe07ea5aa883114e7c0f3b8be64cf4556888d. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T10:54:34Z), 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/QZNJZ2375870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5edabe4ef19897850f9e514c83e26d7a25bcd23566e9d3a925374df353fc2f43. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZNJY2371447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899c3625b44a32d22ee5bc7c27569b2a7b7a9fa8e49f4a848a16267c08519362. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QZTPX2380876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52143d18ec1d5421323fa8b67a825800433f3c265e4bd4e03ca2372080e304c8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZTVM2310108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1eaa39316d301e53c5c04ac6b9ab09c11c0c6d07dd86b04c4cacae708fd422. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZTVM2392432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597ddf55dfe4bfa0ca03a0b0132fe70a669821d565b6687db3cb54233550d681. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:00:44Z), 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/QZW9L2323066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6523333784c29efc9be0fe3ed908f61df98a43dc01b0e72b3a1127767eb658b. 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/US7VG2458543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e3d273056d186260f82ec90444a7b555d64054c54e549a027219c070fde088. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZMZ92445667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9984a42e35063aa76a11ad7761241d89db449320386d170767ce67d1611ad53. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZNJY2467994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4923e3b169e0400fc95c586a54f39e294c46d9537a34b242657a9ad219eefc6a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZGLS2452943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d1b1f5db5bbfac80f5a4ad73429a77bf5dc0834e1b1f7ae1aeaea88e2e768f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJY2366361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb561398067400669d6fdc1ba6c9215f84c0a3362804ec4f2bd375917006f5f28. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJV2332563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208fef710cef1577dce2c8863bc7283c70efff04bd38c42af8362b717a0af233. 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/QZ5AB2333614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e638ac15e6c78e43defa59ee3d8d1960bcbc60287bb03369cbf42a5ca12c5ea. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZZ8B2439690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4688a4b447acf87f5bed1565f6414f66f43c3c9eef3512dccfcabec5906ac102. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZNWZ2486037.
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