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 0xb9b82a16d94132bf57cfff0b3d375520c037d822ba32e2c8b682e0cc4f6000c4. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f478b9f-78bf-4b1b-ae2d-34ade68888ce.json and https://artists.proofprofile.net/proofs/artist/5f478b9f-78bf-4b1b-ae2d-34ade68888ce.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 0xa88f88422975bea92322afa300ff173eeee77dade11a5d5bf1be81e210967adf. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/TRAKF1625203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50dd9c31571c232a9d6489567044eb77254999485ad00ba24b438aa6b414faf4. 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/FR2X42566907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfc02a15f1f78e917b77c530a3e4437cec10352ba36395588b12b87739cff5b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FR2X42566868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcbead62c694eea8ccdfcc96d730251e33352ff2d42398573aa5467f5e01db3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR2X42566888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ba34989a17bda1d043e97fec0e043c02b64036611665875fd2a00118e2756d. 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/FR2X42566889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1097bfb4e8fd9b7328218282458f71a0803de3f911727529b336238e638275a1. 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/FR2X42566890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab179f31feadffef04df6df8e7daf8af2899dea3bc66c1f15fd8faae71bfa5b. 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/FR2X42566891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbf47c42ffb988bc70529eaede1d0dd01fdd15cfb4789bfea8b90f73a85d6a9. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/FR2X42567146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5decd241c7373c10ad76b9ba0ac20edf998ea340db31b88f62b7c8389d4653ca. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR2X42567126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0483e236c4a3269eb06ff7a7af07aeb6d4b9c40a08a7e3c6ae7cc008e5904b5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FR2X42567127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd18696764341937e1c38239e3b5f1019a65a801e228ed96def62c9db0a3162. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR2X42570732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e363292825c527574fe4ae96b3b4b4a6de5466e25ebbf28f5d6a1b489d58ef9. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR2X42566861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d5525680bf38542ac5cb3c6fa7fbac8a898be9fb0097e763b0194083da28d0. 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/FR2X42567130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd784a72fa3133df799307819766f6922e1bbe71300a5a986e52b28921af8d8e1. 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/FR2X42567135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25362bb98930d0a36684cd846faf4dd8cf2d3bf39c9eea6152f0585f3003bbe6. 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/FR2X42567150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2bd3befb2b8392d905b526faf9ab37674919167a335a62ec2b831404863847. 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/FR2X42567159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e03827a984e63e69cbaf6f9d25fcd2b8992ebb9bc1cc5a43aef57239d159a04. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FR2X42560249.