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 0x3e79a80bc0512af8641544cb9dbeddeca5e85c676f7b14d159336ffe1738a671. 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/e79b2ac7-89fe-4e53-a8f8-379fec17b6ba.json and https://artists.proofprofile.net/proofs/artist/e79b2ac7-89fe-4e53-a8f8-379fec17b6ba.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 0x29ccf33d650ba9a833c661e7c48f5b4ca3298009e045c4f1a1d576e951a82133. 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/CAM372300407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4c6f4795aa894b4f992326a81aa8be0f234bcffe333606f7f80bc4d8ce08c2. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CBDTY2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe862d7ddb59c5691183faf449da07e24b58acb2af0ae5fa57abe314285b1a3d1. 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/CAM372300334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff752b721da34b3539b230c3b17fedc30d16ca8cf5aa9ee66cfef201fc0f0b8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CBDTY2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841967591f1d022efe38bd793275dc98effa070da6e0fd3fa8498ab039ccdb2a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CBDTY2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841967591f1d022efe38bd793275dc98effa070da6e0fd3fa8498ab039ccdb2a. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/CBDTY2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7ac9e0e80d984de5857102595e398b4ef9c36b17bf71ab7fe58bdfef6b2ffd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CBDTY2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe862d7ddb59c5691183faf449da07e24b58acb2af0ae5fa57abe314285b1a3d1. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/CAM372300334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4c6f4795aa894b4f992326a81aa8be0f234bcffe333606f7f80bc4d8ce08c2. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/CBDTY2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0225f509de9d9719d711b344bc9132042f21bb75f7a5fb8490cf9e302df77d2. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZPEW2417437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e15fa66d2e05e06519dff5389cac38b607f3b0f123ba014d8532f9098e81617. 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/CBDTY2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff752b721da34b3539b230c3b17fedc30d16ca8cf5aa9ee66cfef201fc0f0b8. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CBDTY2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6183ca115dda9694eca4a572bb403d8612720677d0aad3e079c222799998325d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CBDTY2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d63693b8ca7e4abeb8c219ea0a89e41b8bd95b2f7571134b8cbde8347cf4d0b. 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/CAM372400123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1288df9977bc1f2ac0219b902b477d63a0b111724bd2a271a29f17bcbb34ff38. 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/QMFME2047341.