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 0x0f5d50b78dea0b9da21196164b3ca709ffe881359b76fee347125d0684c62a69. 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/8dfeacd6-d94d-4b19-b58a-571244c8dfaf.json and https://artists.proofprofile.net/proofs/artist/8dfeacd6-d94d-4b19-b58a-571244c8dfaf.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 0xd6535852246491f036619609f067fa63d181a0bdfd7c8597f64cb3282e156377. 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/QZFZ62339224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a1758983337a439072838012c07477eb9eec5bb9544082c78cf2a37bb20811. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ62392554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342e57f6eae5f3aeafb289d4e6d6a283151c989184a43498799d4edd8116faf2. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZFZ62392562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c7b95746ae7c0c0d8288f776adf3e5a053449eb4f270fb12e63577654c076a. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZDA52399766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0d0203ecc1568d7c3e945fd666935cb29ef5fd02687eb0a20661f0d2edfab6. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZDA52399767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a36716b36aeb854805df4bd42c8e5ed7f213aec5e004805d09fff06a41dd195. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZDA52399768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0871948692b022877d69d823f78c9fef16eeba1fe0b0567310d0c43b0c70d0fd. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZDA52399769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9fc3d18fe67a3729a157d1a3f4161b4a950bde8eb9999045bb4e4ce709c4aa. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZDA42370707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1164ba76b66334934f2c789f407489f4c4550dbed398305d681f30027f773742. 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/QZDA42370708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf68c8160e1c4464560e23ea0c8a34053ffd70305498ec12c9b5d7ea1cc3309. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZDA42370709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49229c6dfc0a313ef7abbb8ce8550abc40d8946fdabfcf2a4c4d9917d38e0e6d. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZDA42370714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9716d68b5d8c51994b4aeb3febb48429016d9db1a79b4595393b7f88319cb9a9. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZTB52424236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456ac1147d1875e57105def2f3732cc969c9c899d1160984074d0eba416656d0. 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/QZZ7L2481262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4658f6dda13dcca1835c497e4e35567178de26c88a3dd7442f6187ae3f8c3185. 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/QZZ7L2481263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6253b821058266b720a64bddb098aede9d1fb4b28609d29d71ad9cf7773b8d4. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZZ7L2481264.