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 0x31349868f99c0776879acf7c2b598df35a71c1777717db2a03b0f9d512353e1a. 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/ff18d6fe-99e3-4f96-a894-d3ca868261c5.json and https://artists.proofprofile.net/proofs/artist/ff18d6fe-99e3-4f96-a894-d3ca868261c5.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 0xa1df0bcce58c96cba438bbc314ae96603d141e4b1a8689f3549d2bf5cdbe92f0. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:06:34Z), 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/DEAS80900233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21fdb6c0a103e36dc00fc4bd065ae78d7592aac12e971ca6bab9146575d08b8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEAS80900234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb995ab203dd492a5217924913aeb32eedc1e02cb1ae3fe3cd33a8fe8d5697aba. 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/DEAS80900235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3569b1c63cf7e5885d3e55f0fa69c5807a013d1edb805722f57c33eaa690798. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/DEAS80900236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20fa17ee23aa8882ca46d7a55867240f2a748861b1374fc30549e4844922725. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEAS80900239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c3e3246a9f05f9183d87a199b2df59683b531fc3f8a1b599c348a581b3b0dc. 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/DEAS81700070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fb36a805f061c33982d7496d79317dddc3409d7f77b3e0d6de3496d8f17f5e. 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/DEAS81700072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b9fc0b89db330d7e4198bb1119ea37a8627d9c6b3ca02e0a896d13341c1d4d. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/DEAS81700075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad97bd02010c13dcc55b85cbc3a206eeb83fed748db8cd405dfe2b88d609a8c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DEAS81700078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed03a83fd8f3183a2a908f33baab4b1611267c4fa431590dcece6ac97c971560. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEAS81700080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf23ee0e266ecb851f09d5513657b7dd04a0c2d22885b02d093919653db5b67a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/DEAS82000261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe839995c7fa7b932281dee23ba45ed9415756e44620b4247ee86bc2497c8e845. 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/DEAS82000288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fcbeaeef1a754d63153e42e388a305b6fa1714a554d6adfc7c9cf840fd4708. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/DEAS82000331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c81393446beee0e97f8c2b70da3f8b52bc0518b6bc3e683e981c4f6010c18d. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/DEAS82000562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ff7b281b63f5ef5007b48f4a22b0fac97ed02843cc299b6ce8678c813e5b1c. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/DEAS82000601.