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 0x37a0ed90ed518b5986ee1f2221297e8948cd7b308400e27fc85cfc547ac3856b. 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/a248a0c5-f9ea-4ded-b203-37d831b6b360.json and https://artists.proofprofile.net/proofs/artist/a248a0c5-f9ea-4ded-b203-37d831b6b360.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 0x5a8394783c1c57cd4a0c1112370e8a366bffaac158e1f5e56a168d00bb35baec. 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/QZDA72179418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fab3d10721e8516afd85287c5ef80ed11ef6fb5758bcf7f458e941ec00c4bba. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/QZDA82152106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a3ee12a6590cdb75c5a0c1928af3141d1f2b9d0609b28e3507f326036f8eb5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZMZ92110553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fbb820b40438083465e89fb16d09418722ff424c640f63e6322fa4f499755d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTPX2176217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85899c6abe70be21bbe5a2660624955cc5cc25c4ceef2e7a526137b64b7cbe37. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZTAS2272636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f302a171de64aa78ab68bce392233c8045d7baa9b8d3882644f3d0c096498d. 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/US7VG2336327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a063e8a5781cec8b357534d56192288ef4d1f14e8a0fc69dbfa78c111609566. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZ5AB2357593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d2ff3de6a07db2e8b5c6206e0fc6476a5750d5b29b884ffd1088eeb52e587c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QMBZ92328344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b4ee54c91c5a5322272303c0110c38611650f6af48a78598b6f3e9c70d3b75. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QMFME2317537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54946523c5bf410ae8dc8fbf1ccb93c618691e7c9815c5b6e0d785d27eb65db. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFME2348574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe824741e4086ed561db1280bdd3e7fe55d70481fad74cd6ce09c14cd6ef96c8. 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/QM4TW2426637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc802671b98f5eeecb9063b32412a0c642197db09f00caed9a50ead45d4df267e. 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/QM4TW2426639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c22b95b28bfbe848b874cf0dfce4c97afdd3f204c5f00d5f36c9634d2c85663. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/QM6MZ2408526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16d74f4db5188ffcafae67117881781041ed511a49792f3688e487c4a395596. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM6N22466476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9320054330982bbcd0d071f30ae64ad1e59d53eb3afb38d5637c93b9e833987. 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/QM6P42417035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0ea83c6ef4066f92967dddd4e30e9bff76c39359e0d9155b2896471c6b0e2c. 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/QZTAS2441824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c71464af76893702e9a8ae2d09ae2af27a88d420d913e418479ac1b67eec43b. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/NLK072400049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0c0cb2cab16d295b503181b9c0129f0af0c8423d5f8f25da2fb82c7db6f60c. 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/QZWFV2415849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1570508f2f479e7d5a1788ee6e8759a81189e7d1470addfe322032f0169fa68. 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/QZK6L2378473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1110c81b2323bc3f8a7858d5ea6f35de27cfb54a8873b9125d41ce873ea10020. 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/QZTBD2493101.