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 0x1aa4fe040ca229042cb57bebf24d09d24735c2834316d7438a439f99cb84569b. 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/b29aa35c-d5cc-4cc0-bea3-91f551a91131.json and https://artists.proofprofile.net/proofs/artist/b29aa35c-d5cc-4cc0-bea3-91f551a91131.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xb078a2f551ba97186d54c9e575356a85186ded31ae7c802f40fb911149363f5c. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/PL0G92439008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d54dc9e12728c1fbfdac8ef6ca33f72483dc35ef084b3f71e9932fb0dcd57f8. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/PL0G92439024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7cb1866ed9e1f95d46d35b17639c907a07ab7af03593492670e4d738d3c7c8. 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/PL0G92439025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f45be8fb96f399e3eaf414c47c4b59fb01a093e9977c1976b15e58541490e7. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/PL0G92439026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89dde311ea81f48c69becea0101e59c19cef1fafe3faaa08bc72c5b0ccda2be. 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/PL0G92439027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ddaa75c14eb323b3950b3f165f47b704efb90cda1fb6f3d53bb91dd83a7a5e. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/PL0G92439028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41291da9f1e16b5d69d28a2a27ffdee247db4faeb7c6658c2f7ed727df8400f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/PL0G92439029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d72cf7b615d55fb39765c9aadf1d48c929d3c216c689ed2e061ce76dd639f96. 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/PL0G92439030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84278ee6ebcf91faac203cf7942199a4874864031ae4d2c4de30b501a8aca433. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/PL0G92439031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd669ae28fad5e1265522971c61ddf1158b27778dc152d912ab98a5171293dc9. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/PL0G92439032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3dca5a33d81f5abfa7fd31f10724f4bf7847f84014ac952816425f25548efe. 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/PL0G92439033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f212984c6b5b8627b38579756dba52731e2cb465313bd213e48090c8a9d7dd. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/PL0G92439035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca170a8d7ee59024fdbb796d68ac4d7e4b58b507a3f3ff50e895fdc47a912172. 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/PL0G92439039.