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 0x164c4cd5e0c78f228a886cb7e440cebc94e10cb3acc232879977a0e73922c795. 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/e007c53b-6693-44de-a09c-eff5c5b9de14.json and https://artists.proofprofile.net/proofs/artist/e007c53b-6693-44de-a09c-eff5c5b9de14.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 0x28d4fa5cbcf07aee831978aa4aeef38cd787e875efbe1dc0db5d0022c4009057. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/INS172206717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67d9c5970244f984064bb71e5a666b8e93a9706792d7985a98b841c0550af89. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/INS172206718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3478b3cd6af70c0c105ee18ff07f53335b974648cdb6c283c001e73f6da6dd. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/INS172206719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39f43ed403c137f40ee45330f4a660b212067b7366357431f9aff2d2c8b4470. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/INS172206720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea7301a7e61dccf87c5fe80ee91ed6dee5877de918987ecd91bf2da8911dece. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/INS172206721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e767915fb8b9e4b8dfa396ff2800512b3c6b0956b3c8e2609e21c8541c0922. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/INS172206722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08a145f496a8d3f5650966e349012cab34e05c02ef36f5d99cdeb3b685233e2. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/INS172206724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d41deb2a2d8e71ac43e2a5422a951b42e7a2e244d6323e8de6c0545bfb313c7. 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/INS172206725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84c9fdb8e24c76778485e670f262ebb88bbbd3954e473ee72374a164bff45c1. 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/INS172206726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11eebaa73d60b19cb5009a81fcfb2a80269a28f654ac7d21bf5753f456b23506. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/INS172206727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fceb996b4e4ac7d1ef585094470087e56eca016d1c9c9b10422d775a16d92c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/INS172206728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e94efeb23bd7271623c019cb3a651dafc0479ac911b7a5e8b199ff9cc5468eb. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/INS172206429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38007c16db5d939f0daa6c5fddf09e7345619dc13285a8f006742d934615277b. 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/INE182011955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55635a0e2ed110179ee902477c2fd8b0dc6a6fc2c3ccacd1ce5855e2f920a999. 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/INE182011879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6559de22af76271131b77e1df535b3a74c3c440fbfd690e88eb498da7d579b. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/INE182011906.