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 0x0942a21ec9729abf74cd55beccac8e6dcbcadacf2fa0c24412929c03ab577aeb. 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/cfc32ec1-3868-4bd2-a85a-56d382fd0576.json and https://artists.proofprofile.net/proofs/artist/cfc32ec1-3868-4bd2-a85a-56d382fd0576.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 0xdb76c91380fc3f4612c9b186ac91a009d1022791d6dff61ae4ddc28b0a35359b. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/BXNT62208916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0382d407015cc656cb7b7d0cd92dc23bf4f5d98b34efb0344c6f31d0dcc84fb1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXNT62207996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1b5531eac932d221d64dd2045d43f38e7222d3ace9e819c278139a4bf727c3. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/BXNT62203679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3151582aa23f5c954ea14d6f5f9d33541b3c2cb18ac1c9e0812532ea5533fe1c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BRCQE0900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb4a862d28251e27343513a33ca696404ff675c0133a5649b25331056b24440. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRCQE1900116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4974ef969b6c2a1a43d6d2f7ac555b7bbf68cadd86232336f68efe3728f1ec21. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRCQE1900117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c69dd540c7d2ea7db2bc3be7f14230371b63c40488ce0fb4c4b917792b6966d. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/BRCQE1900118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d9f05f998f00d6d0d1488a8623e504c16626e2ad31f0101ae7cf6046df41e6. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/BRCQE1900119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c3ae309d6c1f96dcef4cb9fc5de4a72c0b6272f395b85f05db1a6fd7f0c876. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRCQE1900120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2db670b8d2cc515f2ec33ec315936b5b1d7efdeefcbbca006ac5647c4935739. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/BRCQE1900130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89b7253c3bf2b042ad0dfd5d9b177fb9d187723ce440e4a18f82c4a1eedf7d8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BRCQE1900131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85a02f9d78ed2caf3a6b8a38a322c933aeda8363c05cbf68b5825a6707b7dae. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRCQE1900132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6daeec9b3bba51d6d7fc9b90306bfff1b14111b56daf4ed17d20ad49b8f46075. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRCQE1900133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf171b98e0835f7c6380d379fd4850c307529d56d298d8563666f5361d3bb8753. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BRCQE1900134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4649926d850ea2741c53a10e2d7e5e9afa7de53bc4ce3f09e90071aae26537a. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/BRCQE1900135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52348e16bbbda3941b90d89387293d702d3fbee2c868252f6b69627c42ae7cfc. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BRCQE1900136.