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 0x190a1362383b48a8e1f67fc050ffac3c62271b571e1cdd35e3cfba4fd8613bb7. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9001048a-b0a0-4c3e-a8d2-ce9d464e16af.json and https://artists.proofprofile.net/proofs/artist/9001048a-b0a0-4c3e-a8d2-ce9d464e16af.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 0xe8710c428b32b60740658873a6dc9bcb64f38fc47beed0f3440255821fd0b75d. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/TCACI1597465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5425c51511d0af13da19234f896efe0edf48e3c2a4ee2ded9a11192e58cd8941. 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/TCACI1597471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001f9f249b35f34539fe6fee43af9eda7239c4b945a7b3c471af9fc696830409. 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/ITG272000126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73eb543298a6d8e1118e613ab0c1e30edb0dae3b0cb5b8fe94d0924d48a24a9d. 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/ITG272000127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4540ea33c8a3e4c864e01da70e810b26d4e33f2b19f2cc0f93bec690faaf5a6. 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/ITG272000128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b27f1683ed6826cd1480bacdb983a76fb4edb99555cf2868a250322cf82568. 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/ITG272000129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3883cb7898c57db529a5091c473952073d647c95e0c1d0200b44cf9013d9b16e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:50:48Z), 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/ITG272000130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb247a82d9a0d7c12df726eb7117159238653cbe261f90a0a2a551f5fafd34ac7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ITG272000132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa016323041ceaf37841c8565dbfbd5babbdde09a8f33fddc0d43e4c17ee3cf. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:23:44Z), 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/ITG272000134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5010dc40ff1bfe01d77520a9281d0169d6e3daa2e4f45ada26e444829051f12d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ITG272400444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed768a06341cc38c57d5d8840ad6b8c562dff341e4462c962afa8725a677456. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ITG272400445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e7374102b7cbd6854156de3550bb37b6bb81bdb6cbed65057fd46013f39a5e. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/ITG272400446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3587193a4308a39b93f78c222e4ae905fe42ebd76e1f343389fe909b88a59e9d. 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/ITG272400447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a7dc828850bb9ea612a6be56fc8814bf979fe040cf2791b033e960fa7b471f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ITG272400448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8ff94667b642a71b8d198283e393f0dc31eecb4d81d8274843aafbaaf0c6f1. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ITG272400450.