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 0x17deba7d2eea8a8c6f136b64c8717b7658eaf800a8887ad118e62e8b62f8c29d. 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/b7e45e7c-d5ea-4400-85f9-301d310f4302.json and https://artists.proofprofile.net/proofs/artist/b7e45e7c-d5ea-4400-85f9-301d310f4302.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 0x4ff0c7b005e645184e5dbc429a2ee35ae44267fda64497d5f137a1f0a087c58f. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/NLD711603139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e843559074fac61f2069b2e4931457cc3f58e4e78295b9b347ea2ad65f513f. 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/NLD711603140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87db2c6f7e6ac36289882b04c4328daa291e0e0adaac1c8ca10916ea768a1654. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/NLD711603141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed67480f6a5cf1da204650559b390230b1288f0a8e65b070062e3fed3b94fdf. 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/NLD711603142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a23db927fbddc738d809a6ff0798788cb142060ae6ee2b4c1c7a108e98d4538. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/NLD711603144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42808e44d9402d147d93ead062074b811a5c0f72107d30ce8e932711c668795. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/NLD711603147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd50d73a0e80d1f7ed3901b1b62a14784f78a9f4bfcd378463a83479d32a7b6e. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZHN32182539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc498b210b6345935451fe50d44c3ba9eac2eb439541c9244785a95001f3c7db8. 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/QZHN32182542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3f44f636c4c88c735cc29dfe4ec93a5111571399a5444ad6ceba06dd799b72. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZHN32182544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5759e596f46c98534813e601e2ca9f5460f97240326ec60a70fead13f1695897. 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/QZHN32182545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72919979e93e726638fc976f43a484cb695cd900a75bfe41bcbb123c4429a48. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN32182547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb743e13ac3889e7c5b13b2725a7e3cba97fce34abe2ae8d087712177d03dae33. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZES52324939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04187a6d5be99aab224ad41d1b8a9d33d74f5d83c3598b73bf367a4cda7ad96. Chain 2 (Bitcoin): anchored in block 957539 (2026-07-11T08:09:42Z), 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/TCAHM2358895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc95029aca5c953f57bb038859f6780d14fbc3a9776fdc3161f4516e73e7608d. 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/QZDA62483794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf822625ef1df80823a88624c82c4405fd253afdfc5c47168dee21c31a83244a7. 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/QZMEQ2414031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1db476fd7ee42fc0db99ec7e9b5e47a72b32ba6bc04c4bdf2e18a5db4e94c5. 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/QZWFR2400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b864a9a071395f8c74ed0f2853ae08e0c74c34c8ce912f04f397906f312c51. 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/QT3F62595215.