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 0x2ccaeca47eb7046b6c5a6f56b401934db09ba4c37785919cd3391a5ef6474208. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a518a60-c741-4efd-905a-871b7067be7f.json and https://artists.proofprofile.net/proofs/artist/7a518a60-c741-4efd-905a-871b7067be7f.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 0x7d8b78314aa2aae0adf9cdae02216793b9c664db70f4aa7ceb3387ae9855a8ac. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZNJZ2456765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feda52e5ba03d9aa6da7d7430e0641e1a5f91fec64b11b98094bdfccb5a3daa. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZNJZ2456775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cab832bf7a7e8aeb823716aacea4e73cb4e931bf7fdcdbc61d6b4793366475e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNJZ2456761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4684f0e2e967bb0a43fb3a440105987ddc04b0d5215cdd225480f3e5b0e76120. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZNJZ2464401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462aede6ffb229561a25879bdb10397a59e064f708ce31bf5827fd60902c14f2. 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/QZNJZ2456434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af898d405e010f8564eedb062a9649b1659af87b38e0849ab24f44271522865. 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/QZNJZ2456402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe85aefc080db22ca3d3a60c6ae22e8de2a6e28b262d6378dbc56aee5d2d2cd1. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZNJZ2456633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91e75e919f2eb54ec861e2b5c505c2f2b9beab8e032e8e621f619a88c45df7d. 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/QZNJZ2456755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3731195af47e98b9ad378322df1b2566bc4d57d093f1753008ab6074b7d4ecb. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZNJZ2456758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f9fd4fa42aa24f945edc598a2372a9e10fcc800b7c9ac877c61c8a543d2fb7. 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/QZNJZ2464372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2679277b36b218f0598ef8159cc8185b25fc763409c9d2a36387bcc0c336190. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBMA22024352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5156327e03085a915ca0781ea77afcdc15f8017ce97d46bfddce48b36ae7d7f4. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZ5AB2401342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf813dd10c6e557ed3fdeb75a5d88b67ff5970643a39f251bc85ed15d3832f3a4. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZTPX2481980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f61c6ee4cb97e9959a9f0eb4e453183f942a09f90c5a07bfa1fc0cbcaf1f63. 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/QZHZ32297257.