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 0xb137bd772e70abb6ebe4db3442573c4cd435949feb6afa457f11c44f9ade0ae9. 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/7f87005d-35ce-4b04-8afd-13c49a1c9830.json and https://artists.proofprofile.net/proofs/artist/7f87005d-35ce-4b04-8afd-13c49a1c9830.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 0x85ef8662ebbfa15a1a5b2f16c0784851eb9802356fd5c76f7d8b627eb36478e6. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZMEM2230906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440484474ecbd5188d6b069d9fb2a35844f412013ec22982385b3cac0b28b9ba. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZK6J2352636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafdcf3842662506180ec9214ab7a8d2d0392c05e2cfa886352f3a06a3d80bae. 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/QZK6J2352638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7ee6c0c04bba969bc53cc4edee7914b7361c32bd09fa8651158e6d4869b333. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZK6J2352639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf523c08effb27d4dcb49b24ce4ecef924a16a339b45e4c0e2dfaccb45b47e6f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZFZ72447045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d237b7a9030edb8640a115f391a1f54c4f03c0c4c2cbb753ca8ac0a55482dd9. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZHN32463146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b97a0c97fc031dcc1509ad6f47f7cc10b91994d0907ac0736481166281c554. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZRP52485207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33603cc070b3e556736fcfb202f40e90835f808bd2c83a8a70902a237f3541e1. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFF2459582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e119293d71828c583d8b35d3be9b3a29300e6e0d32111da8c5e4a8b56bc0e4a. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZWFP2412767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc691e9d76a91fca648bcb5d483f32270fa06089cd6caa647ab72253fbcf109. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFR2472173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f18877db224a1f6429aacdb63a65140ae7b8b794d4d5e026e3cab78a93be28. 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/QZZ7S2479695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164ccc3bf2eddf8d9ae000a11990bee03104e9151319fdb7f80ebb845cee5f3e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QT3EX2419643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0552890ea0d32aa9904b8355e824e0dfa6111530df2fbdaffb775c06c4663d5. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZFZ32546680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27dd0b33f4d1c0aae417f3699c212edaef9052768338e6a12c185e436e33e794. 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/QZDA72541110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1532841a36593f34bebedbd2ffbb0be83d4d60b6ac19496c2da62ddb534fa96d. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6K2542400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af2d009e6e3a0462a0fef539a2d9285eb70b522f294d2f6a2937de998e10f53. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZNWT2596745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c01d9620012a32c4985d0180d6701760c55f2ffc5e2f74010ebfead97f1df0. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTBA2501212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe757a52f6ee5910bcea4e1574a2dccc6f654dc130af5e744e679c0f00e09e557. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7W2596018.