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 0xa1d6b25f6a8c1157961d7a9e3412400b4e6bda9e759d16c4e5d8928dcb469ef4. Chain 2 (Bitcoin): anchored in block 953681 (2026-06-14T19:31:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6472bd6c-e861-4887-aa98-4923590eb5ab.json and https://artists.proofprofile.net/proofs/artist/6472bd6c-e861-4887-aa98-4923590eb5ab.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 0xf6ec24cf158fc51af7c44da12e44300a325a579e3bbfac7c559120361e339d1d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SE6HN2429382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15dbf9fe45a0ff68a6639bae3bb0a33496c26e440c7ffc250303c339d3866db. 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/SE5752471960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84063353165930fd7509ce7e757edad2f6b8984812e0147e3215bf7cdf4853be. 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/ZABKR2400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca79f42f2c1746b76dd58d3359a843bb978c03918b2af349dec3edacd7ed276. 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/ZABKR2400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4e82974dc3bdd2ac4cd3a4bfbb5d47aed44de4b1509ee23e2a237a62dc1ccb. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEH742414340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8ad724536ba1016a4aa78ea3be7cf659c8c3a7bd6ecdd3babcde37e2b833ae. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEH742414341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a8174d82fef015f91ca604d47b20af23e34f1347d900d79e0ed3b48cae4e87. 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/DEH742414342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc24c64a899dcc51997671f1245f558de870d21992e63d6cfeb0a38dfec3d9f. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/SE6XX2329172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706dbf1e82e46d191ae510e8dac89ab64db63645bfdb53f19fdbe59fdaa7d3b8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE6XW2355612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d592aff3adaa54694390db5ec239637a8adf6b380cfb02b1aa6b8eac2e0afc. 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/SE6TI2355519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd6f1cb47aa7c4acd783a260336a207bdb400431470413dcd1f794a84ac9b9f. 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/SE6XY2336792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fddb6d00ff7e0a18758f900c273bbe4e7c3478bdde1ad44ab6380262db5dca. 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/SE6XW2385769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd7f0d1aca7f35f181efc49f62eb36d8c28e48e26230bc7aec4c6f968d0e170. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE6XW2372803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa694d0cfea903e2f48edf02f8f3c9c6a083169eaff6f389045992ac3db5dc5ee. 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/SE6QE2356190.