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 0xa021a36b83a2b5046b5ca0ed8ce37833518cebf1d3bec55adf60e1d8cc0ebaca. 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/e38d8efd-bd5e-4e97-a529-6daaa2133051.json and https://artists.proofprofile.net/proofs/artist/e38d8efd-bd5e-4e97-a529-6daaa2133051.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 0x4a13e3b4d66e6869a584a9f7689685a17713dd09a6214b69d52e1d1f17654625. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZTBB2237689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4bc9435ba58e254f0c51c100a24a32ea238a6e4b01022b1f9de5ab41e017ff9. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZTBB2235025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca166f221256a57a69e8a0f1c831b5bd823eb1b62be92a39be5d201a5a3cd2a9. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZTBB2237683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646dbea47e94a9e93cf080179cd1e3673b2c509511f5cf639d4f3ffc629ccb70. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QZTBB2237695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0c0dd297d10ebb0b9224a7113bbced244194333d3a21c3a410cdb7f09f348a. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZTBB2237693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4dfda4def0729c26d47efc342143f7c68a978fb0a27ae1c12b8daf8e1f951c. 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/QZTBB2237697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd13c914e8ce9008c19c517493f61c2c835ff22c6088729b3a3ed78d526d84f1. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZTBB2233767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6f3cfe5f3973e5e45c0a52929eb078b784bda7c534b4e30f505c0d7b2b61e1. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZFZ72304680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd3ba94432135ec5ca7746038778f5fd4964703cf03057a803bc267827758b5. 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/QZDA72310728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d8c68653725ed57a6d7429269d382aab1f91d58545828d4418c95b2cab6df7. 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/QZK6N2358319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed178d869e04180d69dd130c0adb04695864a024218a44a4be9cfc2a1046b08. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZK6Q2369560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551c36b35dcc2edec8308b107e8ab92ed56c6c7656423ae431d60ea80bb4c257. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QT3F32419647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551c36b35dcc2edec8308b107e8ab92ed56c6c7656423ae431d60ea80bb4c257. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QT3F32419647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac5b14cfebc143e572e506e670d299a36f6fe8e9d12611bf6588d78a3486df8. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZDA42595748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac5b14cfebc143e572e506e670d299a36f6fe8e9d12611bf6588d78a3486df8. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZDA42595748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe081051764a753f93fd9abdbde583a22eee61cddbbe7d196a11fc41072a7b959. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZDA62529413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b0a6afbc177cfa11f8d1f1d1f693d4a7c2e54ab21fc58354a30d0e0711fccb. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZFZ72599166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe081051764a753f93fd9abdbde583a22eee61cddbbe7d196a11fc41072a7b959. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZDA62529413.