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 0x436dd9542f068fbb7b59aa7b6f0ad56b08c0cfaff9d0187de2dd8f554c859c78. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f94e998-cb40-4ae3-b9c5-dbbbee68018c.json and https://artists.proofprofile.net/proofs/artist/2f94e998-cb40-4ae3-b9c5-dbbbee68018c.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 0x3a1a54102eb1ec7f7158bcf00a52bd4222f9b65a3d9845077dc1bc26fdd7ef27. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZTAS2329746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d539183b81462610247ba34f6932b53ee314e623b80087048d0e28d85183be2. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZTBA2350090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7c100303673444efe5818bc8097fae0bff1616ab050b42a114764c63f681e3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZTBA2350325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6935aa4c9f6f5ee328350e874aacdad6f66691badc91ef3ce3cedac807be91cc. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZWFF2343150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56da8846e9f712e4e0e5d20ca0399f5e79baad11f47ddba4e54e663b0a5aa0aa. 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/QZWFK2365723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9e00b5f92b216746608be89f5197f766ff15e39db34281f032016fb09271f3. 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/QZWFL2311116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc628ffa4be782f12af2f21615822f3ada3f357e61d3c2a8e5f7162112ba3b553. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/QZNWS2490758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3281e66e92e3a244c02d8a933ddf9a0d36992beb66740c281133e2372a4bf7e. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZNWS2495811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c78cfa80ccf5a4becad17c4566359798533f0648371b22a4362b23a0ee2bf59. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZNWS2490756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9dd253bdf3edefed6c171470aa27aa26a38ea3daef8ca891f8a4d88e14a822. 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/QZNWS2490754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e891c4099a313f3c63f4b53bfffe9ba0d73b9d8b02d86ef230788515cb89af1. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZNWS2495808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2a409c2201cccfe7374a036f848866b9b635f03305b2d068b4d0562316bccd. 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/QZNWS2496991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84ee0892c3bf22bd9130f0b371ca9bcebaccb2278b32c72b17a7880eaa2f426. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZNWS2496999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3fe43c75fade8ba50648ec6a9745a9b112476441d99d09f0d6574f7691dcd2. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWS2492929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34b5767e4173ed6a052306561c372b046f7c4b056e363747a1ec3889e38137f. 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/QZNWS2490750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcb07dd4fb05dd9cc64afe9f6594e4a9c3a741aed030c1e38a6f9e07415a1b6. 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/QZNWS2490749.