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 0x78f2f288097c4cd369adc8eaeb6d98231743f1555860c90c0b8f201312dda9ff. 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/a722cbf2-7b1d-41ba-823d-ff63b83587d5.json and https://artists.proofprofile.net/proofs/artist/a722cbf2-7b1d-41ba-823d-ff63b83587d5.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 0xd3bbab54d32cf13bfd01abfc822e9f10408ed865acaaea5477fa60fa8c2022d1. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZNWQ2093289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d49a5cf3fe442eac21193eb5beaf643b4fe9a9633fd4cc42f6fda1c256c53a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FRPZ92223530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2c0009514d8d94aeaab97b7e10865b67a1a9f7b773876878e802f65aca3455. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/FRPZ92222470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dd63de46b4be3327dc9aa0533344a3e7d83dfb289875f9252aa6bb2a55a164. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FRPZ92300210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53faf0d049f46af1092ef75c2d31849bf407edee0d8a379f1d9bfe788bbbcc7a. 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/FRPZ92307440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aac348049fb6724013b82528101ad9fa70cfaf33185267b918c87598a3425d5. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/FRPZ92307420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53faf0d049f46af1092ef75c2d31849bf407edee0d8a379f1d9bfe788bbbcc7a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRPZ92307440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dea191abcb945156f4b4f617914abc318d73e8160b69ea8e7217cb0c7d0f651. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRPZ92307450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80129947213dcddd92ee2cbec3f5c16dad2ea19fc20b53f1854edc980eedc7a0. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/FREFR2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f088ddd383d129db31001d93711d329e184783c898698dcc3977ace94a9e697. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FREFR2300170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26dfa3247b7887509d84b49c59de2835fca652f29e15ad12e141a8d11d0a6f5. 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/FREFR2300180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1f3f50722903c1516fd91c5bb7486c462f5a33602f400014ff1b370a3add0e. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/FREFR2300190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac971f7dd36c0bb76a9eab9a67065e2204d7e4d732d51f2530a513004bf526cd. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/FREFR2300200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0bdb8033c4ad68245c2b7c69055eabc52177a8f06553819dead269490afc36a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FREFR2300210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2ff3a961634aec1272de5b85af38390b8f4d03b3c3b1e19ac69d0c1eb9eb73. 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/QM6P42216072.