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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d16a7ee3dacb0bf46465f76e6127d27108014ee54bfc89d1aa54453bf0efb36. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ebf2bb42-1f69-471c-9ad0-bc8170830655.json and https://artists.proofprofile.net/proofs/artist/ebf2bb42-1f69-471c-9ad0-bc8170830655.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962416009ed6024a3fa147a6ce5a808e2f2c34ec0d7ccd05fb1618d8af6e275e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ES7739301002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0aa82a44fdd4ab29cf712ce08628d742c90720f4636259cbf4a9fef53ccbff. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES7739301004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a441949e7d208918a451a31d6d7cf8042328f15f61cc63c72e565efa405850a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES7739801004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa367c2a80077d9bcc1168577785355af4bf6b1324ddcf90fa0c34d35778a714a. 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/ES7739601034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d7c47a1caeb0f6dd369879f9ee0269fa3c8b6ad557985cbc326546a5757056. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES7739601024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b246f425075356afac28c509b60548e8551433f036a5b16bc43f85f2f1dd230. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ES7739601023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190b8680dc98eb738a0c6188a354153c905abc306130dbc637b65a3e61293d29. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRVLS9600522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4af1543440e023f519d1e04378abafff91da66f248e25a91f2a77fca35948fc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US2W61850801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04c6cd17f9f436c8636c433f2c8ed8c377b6ce817d8a74fc6030309916a3a72. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/US2W61850802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30974250df900921a1468f05a2e0e77db0dd1f00c1ceb87226b34abe4893d8f. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/US2W61850803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1f4a80c76ec82860651872479e502025d36e6d09e0704381bfb06d6c2c38de. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US2W61850804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6363603b840dafbcbdedbdcf654bda986926e7404fa78bff431cb8d79734e9ce. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/US2W61850805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013514b72f3049544990865740688bc330791aa18ed61b105bd3b4844506bf2f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US2W61850806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b68c59727616edcd4b0ce93e5b77d7ff1a5469a8d69a2c9a7fa9bd34bfc5fd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US2W61850807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32944e506b2f52dee35b19ced11974dea57821e5c98b279668283dee54b61dd2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/US2W61850809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e51ca3e9baee0f649b6aae5341d19d5b0cd733a5e2d25683bd6a59cb640516. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US2W61850810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecb1500066dcee2d91c0770d8de8216f6379adc75ef0b927950c24995798328. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES5120200520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453710f73de97f61a300051bd825ce1541b2f68a74f11eb578ae99478fde3778. 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/ES5120500932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40641666707db0e2c824815ae00287334e2430882502b3e6731e5238dac54d68. 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/ES5120500933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce1ec5d394a0f61b648e11568a40202a019bcdf011e6c98acf9f6fef80afe9f. 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/ES5120500934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62c4fecf0e38f2df20eeb2e12c8b1f8bca218ba24f14a084e0e7410e28d945b. 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/ES5120500935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024835cc4658956e581a987d5a7751848b8087fab24c1a766004ba1ff6aaf12d. 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/ES5120200557.