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 0x81fbf41ed3c3b1f39053fbcaff402c407821d7340ea1cd58d0383ffd97ff0002. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a9a6894-d8a3-4d19-a4bf-d7f03d27e3d0.json and https://artists.proofprofile.net/proofs/artist/4a9a6894-d8a3-4d19-a4bf-d7f03d27e3d0.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 0x36d125a8dc9a32b9d5f3ef685529a73fa005bee2b820c8b57237db9cf445956a. 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/QM6P42177983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3afb5ff2f2164c59a9e87dbfa18ceec09ebd21fead3cb53c343d7cfd7a0568. 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/QM6P42177984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082a223bb53a065fe8b84a32d75d8e35c30ba47069549d0dc80e9aec3446e88f. 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/QM6P42177985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7d93d784bf5b776b15c74427ed3ee94bcf2aeb7403438eca81328b19874a7c. 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/QZK6Q2052851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff7040791af00af80e0c1cc9d41c8fa2bc2e1eae99d41d3efa071b786239337. 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/QM6P42177987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634754f53585d525a98849a3226840a9acb47e540da382b2e225deede6fb9bbb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM4TW2172666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8cef0601bc0ac340a8b47aa03720ae8be4831419daaf32fe83e18a54451961. 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/QM6P42177989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab758918a1c7f89fac10a48571c47b8f5fea4e5ce6809c07aa125a786b0bc16b. 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/QM6P42177990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b54c98ed8270d02ca10e4bbff17b4f38ffdb49f3f2d9d6cccf07f0eb015f6db. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKXN22365274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a1ee4958f61bdf916566e032de2d62ac59d600ac0af0e5f8338215838f098f. 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/USRC12302021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83562638f7135d1e57299c4ead6ac981ceadcec777560a46c52bb237b52e72ef. 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/QZRP52327605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2fff10d9ed2db0700599ed385ba5544f6a4eaea658c6192473a2b3754cc501. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWQ2322856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98068475a204893fdc091076782e269a933f70419625424a38467e9d95d065dd. 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/QZQAY2396957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a292b2147ef8973c61721532f60070feb8a8554bdb548bddd13edc09fddc9d. 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/QM24S2204895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634754f53585d525a98849a3226840a9acb47e540da382b2e225deede6fb9bbb. 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/QM4TW2172666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7d93d784bf5b776b15c74427ed3ee94bcf2aeb7403438eca81328b19874a7c. 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/QZK6Q2052851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329dc9ea660a483c4e59f987c28995c5cf076e0e39eee9bcd09929ff080eb711. 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/QZFZ62032522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703199e123abe1163c547bb5be10bfaf9dca7add151db34de1ab0c60c7538aac. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZFYY2096106.