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 0x1ca10c47fd0f5a40337c19b65fa0321db62b2829c8ddf065863d8494937c1cf8. 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/5b6a0489-595f-43de-96e8-fac1b59f3374.json and https://artists.proofprofile.net/proofs/artist/5b6a0489-595f-43de-96e8-fac1b59f3374.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 0x1f62e69b7797b2ce9b814f9c010e9544377cd45d9ae7ce3b25c4458e6ae6289f. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/PLH921300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38313a7d36059b1cdb082ea5bca0acec114513a50dbccc5d1f1334474e14be50. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/PLH921300203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefce0203a2fbb3b323b5a84577bb51c9ceed669f434156ec2da970083b141eb7. 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/PLH921300204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e519344e748c6c9c401ce32cd584a8db0e1846df1c2739d6e6dd1937d9ef26. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/PLH921300205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7c868e057bbaa53e945e82c4e5ee2db88f1900b23249283305d1a9560f6184. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/PLH921300211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6316391ed01168109e01717034f20d97bd24db07df7d58dd2b115452257e7052. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/PLH921300213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd76f66f14ab14658817242a14a00f8e3360e1f2df4fd6b6c4f9a2bd032ee671. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/PLH921300214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19234a114c0fa57be6a02287e41485d1bb03dc506e5e5e3ec4b9bac14e20207a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLH921300216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe5ba4e1160ca0f3d14297909cb8d6544088fe13a4de467c6a5a2e80d6cbbfe. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/PLI411300475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1954a225f1f1133e891efb1f545b0d84e51f64bb19fbc1444aad946ca17664. Chain 2 (Bitcoin): anchored in block 957690 (2026-07-12T10:16:40Z), 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/PLI411300479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f379df27c270da673dc5d63f80b0fbb6719a7f2b7976dbc2ccac649c6d154d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/PLI411300483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60eaf96862209b00fe3dad6bead5f8f6cfb2a4907f6f6639a1fa00cd6ab7356. 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/PLI411300484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fe024abe52f521758716261e6172fa3334a905e51cf6dd93664bb714836ab0. 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/PLI411300488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0979faf56e6c45057096d4187a32629362f29ace6a8161f249689d5350b2a6. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/PLI411600086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48d4568aebb9bd57e4f504f2a8b5cbf9bf1dd1d4415f1437625e34f3916ef8e. 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/PLL171400172.