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 0xb37c1296d43261f9d004f063a4dc180430bd16783b1886b77cdc0f6023c2720a. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0d6ad55-d763-4cf7-bd6b-317238652f05.json and https://artists.proofprofile.net/proofs/artist/b0d6ad55-d763-4cf7-bd6b-317238652f05.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 0xf7fead4d14f46ffee8c5950fd53e40c1be63c0a7e67f4ddb3033ad918cd76a9a. 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/ES71G2240028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8eb69b1c95e5649779d3d346d32813ec15992507d21f05f0f6b4a04a98600f. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/ES71G2240029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992405f11d36955e233e2acc54f63f50aed26fa954229b287b196c8b3c3d704d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G2240030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ceba4ad61ca830128a0f0463dd11f744fbfcc81d9fa8fc688abcdae5deaaa7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES71G2240031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cfca1ad0466163cf4f3179aef98f506548a516b6dc13c14a633a91d6ab8245. 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/ES71G2240032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe080f49daa31b5961174becd9e23610365926288b74fb7d53559af2d5e1c68ed. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ES71G2240033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687422e2766ba0cbd16a2be90aa8e293d13a439d6e076f2cf84d006613cb2507. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/ES71G2240034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1842c7c832c03715931c2e04efdfdbef936344bd3e4f60f7902ec35effbabf. 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/ES71G2240035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f60b0b8ab6f7eccdd4f1d76d9fc621b98228e336fe10804d4e855420cfdb21. 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/ES71G2311911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934fa0cee40a272fdd5ca6a82d435cbf13fb066fb2e6d7d056e8ca95fab72884. 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/ES71G2214794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109ddfd69106f67da3c1cd77b98073958b7bca222e2eeb371eb6def4e857b4a8. 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/ES71G2208443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e4aae7c2a057fdedd16351f118d05588e8438e54ebabcd7f2d68415d216c73. 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/ES71G2420923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992405f11d36955e233e2acc54f63f50aed26fa954229b287b196c8b3c3d704d. 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/ES71G2240030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b75bfec9efdbe26e64152c0270a3a81411f9d4c9528febf7d2a63037edd8cc. 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/SE5752022102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b57d6200b95b642f27b3c3950b42700d3239fb23f42323a7efe5157abd4ed0b. 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/ES71G2202761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f94f90d2147756bc4252acfa58bb5b67fa91f51ccff909209e0ca03fc23ad8a. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/ES71G2201693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fff345db0e1f3960142073cd97342e2fd6b307d86575fcb58b137e7c53f7eb5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES71G2151465.