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 0x8e36f68811bf1d898ffa94353720eb64dc81d56cbdacbb7b3b6a78fdca826f55. 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/d66346c6-33f7-4438-9f9a-48c1b1448727.json and https://artists.proofprofile.net/proofs/artist/d66346c6-33f7-4438-9f9a-48c1b1448727.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 0x050631ba2b8ba6dd3ebc7bce3fc9864e02fef479c6d5b6b2e85bc90cc019417d. 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/QZHN42082392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acc11bfd5202b9a9923ef39289667f7a805c6262b1c9c1afbf3b891cb2de32f. 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/QZNWV2180761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787b0a5815bcac05942043fe1f19df1b47f3ca426296241fe72b94def22d1a57. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:34:56Z), 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/QZNWX2186495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8e16d671554d87c6e1d3b780c5a4b764a7c7c9b36e7dddad320d8741085762. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZPLR2152170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885f5ca301eac7db108af00056aa0ae14b53f4faddaba38dfa20b0888966bc7b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:07:07Z), 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/QZPLR2152173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9862adccf5f55b3e8b4fddfcc337070880e698dc96a96f949d38071a8c2609. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEP2291632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb686866a8d3636e57ef875d7dc0c8282b3430a19e071d1819b2aa1772d75cf82. 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/QZDA42312407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb499e3f3c9f5df19834757d30ad1d9f597476115d8a85a219420c92cfc849ffd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6Q2325378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3f6421d9b1701b9f76732fd95df049d2e6d213ad8b3c558267e08c6a54dece. 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/QZHNA2328478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ad9002ce11a80f50db526bb99ffe8439dd758f0d1b65e593c4c6b6745c2b49. 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/QZK6N2303441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee13996cbbd99d29e8d56677104f48d65a46991a9c5c3db61e667953f128ea41. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6N2335275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7955678a11c29e436b9f8736822482145da3613fa1571708f14b32e8dbcb62. 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/TCAHI2332360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96054f40a200caad790c3c7b3b80efb0f6eadabc892a15884f50b63546d927f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAIV2464357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fe21e670d62c98c52c4447ecc567dec799dfcb9bd1ec912cc41cf2e0a5865e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:38:42Z), 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/TCAJM2540024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee1d93c2bb389a5b21c1bbe04f5c0eb2792227930e5a92b1738ce98f51b4b5a. 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/TCAJM2540294.