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 0x4901ce41d78870ba5531fc069cc3dd3caf9715579995401e3b6f3d2a50be2ac6. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/351668d9-f956-4fb1-bd0f-05c92e7237f1.json and https://artists.proofprofile.net/proofs/artist/351668d9-f956-4fb1-bd0f-05c92e7237f1.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 0xba4efe9d328298399c209b03d12f1638331e176bff3a84c54f4c9f1dd7aa1b09. 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/QZTB22545572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c67bd532abfda194c8e499404e0a3cb134f12338880990cf4c5bbeb958401d2. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTB42505796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc308399ab7cf1028f9b26bb4a79666c2e0143f647431d34e4a0c66fa887b5bd4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTBE2575044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07df2c5cfd0b361322d6ae42a5b5afc7f7276c6333379abf9dd12f46d685272f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZTBE2575077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39b28d16ee27a9ba6d899ed3558f7afeb20cb7cc55f3550c432d9ed839fb672. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZTBE2575038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ae23030933673cedb59b51052e39b1b87c497b1a68b69e8c816cdc7817830e. 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/QZZ7U2534839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0328fc65cf356e06e88ba38f085d57c97d3384e731995294416e964d5b39860. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7V2507185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4383943bfa5c2b8240547872bfa7fc0ab55d9db17dac864b00520a9c7d96eb8b. 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/QZZ7W2514831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d3da75d7d804c955b5221f2a8b620f3ef418738ffeee1d0c8d6340ebfaee67. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3EX2586817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17e4918c0e58c633a1c1db015e1948e303ae55080d16d89c983e4ba4fed8c0f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QT3EZ2522511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273e8961ad6240722316048b7adf6753bdb5569867574905f20832d48afbcbed. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3F62542163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57596f5b4715a849a73ab51c8a6e5d2e06d04e225146ae3cf8870c0c5e77311a. Chain 2 (Bitcoin): anchored in block 957791 (2026-07-13T02:46:19Z), 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/QT3FA2529357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1269094a27e9e37b84db120c3c350ac35d3700fbf00b76636f0dd31c22f7d03d. 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/QT3FB2542278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ed224a5b2bc395fc39302c803f9b55a003ec4aab25aebfad82b5e91c6e2ae2. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QT3FG2560501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b17151b0819412325992e4d289416eee8c4e0aaa99d908a7dc6223a2086840c. 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/QT6E52520806.