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 0xc1f4581689cca9474afb5e94603c3191b5bcc451f39565fa1770f0586e43db7e. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8f1eacc-7a28-4d12-a73d-bfd79ec9fe85.json and https://artists.proofprofile.net/proofs/artist/e8f1eacc-7a28-4d12-a73d-bfd79ec9fe85.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 0xfe590c1b3e8d1f422ad5e32bfd28f98465f65ab8d52d9c1b7477919770fca34e. 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/US25X0900301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095beff64bcf56a20b8d31483f5cc21a0c3b1244183ba446d5af9508bec8f06c. 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/US25X0900302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5803bf0b2bdcbd53ef7c75a2404657c0f0032cd8043ad331d544c10cbf79dcb9. 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/US25X0900303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a56bd5f69ab79feb19eaaaddc897451acf66cc10e34ba53ef220efb7cad76a4. 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/US25X0900304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90596169a0e62d18e54695c2cd875f8766876cc4114e8257e38494b3b929d76a. 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/US25X0900305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc50154ffc9eb70f04473d64406592f2f92f22d7ffe6c45d7d7b2ecb4d3f4f33. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/US25X0900306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0525b2eda9ec4a314fbd8582a482d698a02896808ee3d6483167642113102d2a. 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/US25X0900307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa151bc112ce0b11b3463bc901b6fa839023ccc877c051bf9abbef25c6cebff18. 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/US25X0900308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46e980f6ff0f867c642811d640a10d82f311f97eef2c08a143ebd6d79235756. 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/US25X0900309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e69a4b9fbeff8f6e064e414a9416efd5cefe5a9df8ba0084a4f9ad99d851dca. 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/US25X0900310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78049908680d09695b763b0638720d23b5d4f777097a686d513b5c8be43ca52. 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/US25X0900311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a1a25b1205c0f4faa89336ece27b3b268c983c19ad03bbad4590bd4f9e22fe. 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/US25X0900312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5aee504f566d103639d5fa1082eba5c009dc8ac510399efca6015479c4c853. 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/US25X0900313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bca476c512ef993e503fd21a3b30c44c0f475893a59d4f7cd9d6571f7909e2d. 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/US25X0900314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38522e05ca953301e00ea47871e4c6a5d82a16c66d18fbc17d359f08d565be33. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/US25X0900315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ea06ea86994d225596e0b668e911e02799ed400063699fbc2702a0f920b197. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US25X0900316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c7cfe3ab4885c678437f4f2e349976f342103422773d35a75316d6fe4aaa6a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US25X0900317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e68eb8f0feee82f71008d802e68bba4dd9c08db5cefe33edf26b28d5c7112ba. 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/US25X0900318.