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 0xed676b06186ac20dd3fab10a4eaeca943bd33f3e5ea89f15c2633a5ecae2288a. 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/f2df448e-2c1f-4773-898e-7b2a2b84fdd5.json and https://artists.proofprofile.net/proofs/artist/f2df448e-2c1f-4773-898e-7b2a2b84fdd5.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 0x2f4c4d258af2f5856f1eec7e78e1514411b1f43001e32275fb758b06668bbad7. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/NOGTA0307060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dfc9f883d83bfd6a183d102c0c57fb3e94c23dc9699c43fcb5fbef47ff8eaf. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NOGTA0307100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c22b331814768f001aa71f200efa4287eef06ec8d1697474857d7571bd2989e. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/NOGTA0695020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b8934bb30f530f295f38f3897dbb0e71f0419224b2cb7a334457eecb400577. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NOGTA0599070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942368b8a868007ba33884c4a24f8ab9bfc158c9f6da8ed94dcedaabb2ac666b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NOGTA0695080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a1f3a96e2449eae09a2e49e67a8f580f36a0d753b4f3af4acd17aa45c7175c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NOGTA0695130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2086aed51c9ba2e12bbfd6c7090a92e3a392b0a1cf4c8aa88a699878106605. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/NOGTA0703050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5113eaf8545df0abf22b86cc5a4fae23c8ec41770877a71cf755a9016f7e99aa. 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/NOGTA0703070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4e6886eb654998ef6cea4a3b36f7aaf5340fb668207ac09a9faaa0b498b7b9. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/NOGTA0703120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9478ec0da5f104998df71f39a495534eb35121ccf92e029959f0027eca9f3cfa. 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/NOGTA1035030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cb6c298cdecef60d6232781fbd4a23d2e6f019cd11f76760b84eac10fa6077. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NOGTA1035070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4d5da526e4f222cabb11213c40ca243c4e61ebe357d583abaea72db0dd99fb. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NOGTA1035080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9728008516340febd77619482b83fe9efa58b5b36d9d3ad9dab8aa51cef12a. 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/NOGTA1035090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5875f4dc1939b1d1ab773324a12c54dc6b8812c8f600c01ac84cf11216d71aa3. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/NOGTA1035110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b804ae051a82969a64c86131a9eb89ce7c1997830b39c84c74a778dc5fd7b9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/NOGTA1035140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9002c1c006642c41e3323d8247c08ba493cdba88448c00d449c50f647cd36d5. 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/NOGTA1035010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485b9ffcab198a850c21e653306a286f8fb6fafc0d8dfb06f0349ad37dd198f6. 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/NOGTA5814080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c7953d19474b684da5e860d1453cc8ed805f45e96830938983c21b6462c2e6. 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/NOGTA0398120.