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 0x224b7f8fc1aea7899930c390f418ce77b23bfa8d54296558dcefe2252706b7e1. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5d884a6-bbc6-4e71-9c9f-6ccf32089418.json and https://artists.proofprofile.net/proofs/artist/a5d884a6-bbc6-4e71-9c9f-6ccf32089418.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 0x39c9fc049b0adfe8b609e517cce3103e9864c7cb8ba95070a666ab8b0e707c1f. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/GBCKG1700201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b48e2a5c46e43164e1f2023b63e8bae5abde209b99f261f96b2e07b39b2f692. 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/GBCKG1700204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe944bbbbeeacda6c5b39a70bbc83e3153b78b68e5cc17ad43662d9cd8e587f69. 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/DEE792401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51baf3d616f8a44d4f24f9ecf857413eff4b48f395a40b7ce35b3cb5835a1e52. 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/DEE792401020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6cec6a496b7aa72ad4ff890ab0630013da8d41f106b142557ab834aaa49e4f. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/DEE792401030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d472a17d42580de91183d018de3a2446a2aac1eaff524acc9f548d981a9d549. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEE792401040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c879bb2b3a03e36f113ff480935aa741732f6c62e1109e0d82b0522a8c5c1e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEE792401050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0ea15114acadb1bfe31911e31ad85789b1eecf7a4993ba437b9e609ea2c5cf. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/DEE792401060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108653e31567f6619e1d9f80d5166d5098cd9b602ce27e1a468ec4b7dc8349ac. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEE792401070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01564754faf881b4d2a9c141ea08186df5dbdaeaf6216d8b5b1ce277369bc240. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/DEE792401080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab5e0e19790e6c00da21ffdcbe609063347b4b76f758eb31a5a075a3946d067. 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/DEE792401090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367a99c16ce29fef099a15ad402d2547368954d2a7991689af6fbf7ba44e798e. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DEE792401100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89aa24e08429487756cdafbcb9cf66a7152badac1e1e4552646cb9479ba995f2. 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/DEE791501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1501e5ec931c0c18a9109e84b1c10da8449cf7325e209ef4d5c1a78b64f63c. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEE791501020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534dc1cc36a78a9ea54832a2b2660e8be2ec84bc880fe13701cea93eb9377b69. 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/DEE791501030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5e372c34642ba64f45bbcdb5843a787dfe1cd4501319282026a3b5d1cb1c45. 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/DEE791501040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373208128387a5e5198e6be16fa5f6e89543edae3a4773a30f1fc1779de681db. 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/DEE791501050.