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 0x3abb4d48549bf5811dc871126386928cdf106747ff3a5918ee845e4069be651c. 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/06ed8f88-b4c8-4803-b6f3-6cf05f692ff5.json and https://artists.proofprofile.net/proofs/artist/06ed8f88-b4c8-4803-b6f3-6cf05f692ff5.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 0xa8b2fbc3f85069498c2cb93e2a76e5f273c262a28aa89d8fa628a4c788f2f00e. 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/USHM22402238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22483e58a74fd08e000492d9adda0667095cb6826fbd019af992e8248fa1e65c. 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/USDY42426693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1b27f93d7e012889ee3c17ed5b363bcde1def5cec7e8e7275d4e1f65c63113. 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/USL4R2352580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a13bc8a719749b5fc231c45430a5ce1312dd9014c3250dc1f86d0575ecff5ed. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USMH92325595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb436fb7522f9f98d2215f382fb2c9976d915e057a0af27f2cc5d093043cf84a3. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USCGJ2362614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb6ae49520835214901811a3b551a1612a58276e6689722bf5eae1770278385. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USL4R2235711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf030706d4ea063587b9a2eaa5331eae4f473f54be89e3639f737aff76fdf93. 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/USL4R2174773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9384113e3ba3a251aa6920b3536f35bca41a99548eca32698c4aa8edc43abd84. 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/USHM92115583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5961d87c2e0341760fbb75abe5e7c91fd25de752a13e03447be7610c97f48021. 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/USHM92115584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f7f19b50887c5b6756ffc915d0a17a969081bf6fea8066927c9e06acc44b3d. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USHM92115585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cd0379e6d38f118ff198b3aad5eafc83d19589c1dc2edfe6cec9e0be1e947e. 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/USHM92115586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5477632374b5ebea87d2e865bec8ef1ba02e8b14d64d55bb6a56788b07b8e950. 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/USHM92115587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a2d569a3d5c540564b11571140570828f25ffc6492179aa1f20af86f1e85f8. 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/USHM82081182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee0a4a832eb49a62d244a9687bc3137db5fd55b17ed3b106f7630c40ab2d1df. 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/USHM82081183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3556843d191bcf09f3f280841f60379dbc411630d5bac9b2570d6a3c813e51a5. 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/USL4R1930552.