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 0x02de43d7bff0a8a3eb78860b2da31243b581612e39e5288c70c281105ab3d8fc. 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/fd0141b4-b44e-427e-b676-aba628827533.json and https://artists.proofprofile.net/proofs/artist/fd0141b4-b44e-427e-b676-aba628827533.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 0xa15159e9a4dd9fed60444a1d4d19ddbeeb17b8732389a5d53af5a8d789e9f21c. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/USYO40802202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d9bcef73d143ba3581a47c3589601089a641fca907558725f568f50ba70687. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USYO40802204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9ab350a762a72dd89c76fc7876b62c5e4304b036fc6372efd3ed11edf4ff9a. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/US3SS1100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbcd229dd6e52c8f4a7fc41082855fa6cd2abeca062fd4a27449feb227d5c11. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/US3SS1100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b63ebdc7a5105f246a9ac97fdde744e07bc03ff6246539213b5734095c90e3. 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/US3SS1100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a0a409d317088251405b6542ce261e37fc65ca546ab314383d7f79bec697e4. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USH5P1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b45ddff7e13bc044eca24eeac09e00c0e314347befc4bad3d7a11014e37545. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USH5P1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac4df53b7758b39bb8eefc72740f41f6f6dc7aebcc424571f04f7d23fbba342. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/USH5P1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4ab4226687b97865f15fd35eb5b936cf3d0493827dfb3d8b7ce1ada11e698d. 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/USH5P1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3551386ef2cfdb1d3257250bb06ae6fd97c0eb320f17627528aae3e81e7c4c83. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/US4M31407502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95285d5a0a9b944d639ba0f31096357789caadc9ebb722759dc3b81a042c715b. 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/QZ8GX1701790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c1568b825c57ae07e421519aa13bb78aed3cb3d975c8b40e9acd2e9b7925a6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QMBZ92526576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f00f6be151bd8e4f213e27ef2de842ce178f537e9fec1ee3f88016fda2b6858. 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/QM6MZ2545746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992302dace864e51a1fa16357c123f3c9b876e89a8d084e6d9c3f5c23f992205. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QMBZ92526626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9548c50b3ee8711afd3b35a6b6f80c9ec747bdd51fdef06bee650c67e0b992ec. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAGI2278421.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeadd8bc54d1ea68fb9e5ec997dff5e395fe47dbcf5188f60dbbc67c9ba105954. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QMDA61544025.