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 0x048742dd466eaeea4be460160dcd1a98c5b7a8c113314545e24dd28ffa0bbaed. 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/40bf03e5-a6ab-4716-8cb3-e5439f064ce8.json and https://artists.proofprofile.net/proofs/artist/40bf03e5-a6ab-4716-8cb3-e5439f064ce8.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 0x62589c97216bf6ae112f4d1ef28cb2f5a66c78cc8f18b22cb60b6b0f79a10232. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/USHM80324758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d35332d392d225cc9399893b92274452dbd507b534fd2ff964e16f6d75a0d20. 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/USHM80324759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f1319a0e4a26408fad89a11c4ec83e73b84be22f546c9d2594013646f8b19a. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USHM80324761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c897c47dc3a3593c6924fb90cc19f8b2e4ea7267a1b655e17982d5524a3ad2. 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/USHM80324769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee70ae341781dd2d19d8a458bc0987dc45d54a49d80a2da3c1f5ab8f94b021c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USHM80324770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b080666cefc9d44a866aa50b82e09cad74ba108385ab289b604c88534986c5. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USHM80324772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc323998b1bd3882cffa9ea10cc81e0d566e8fff79e2c0a3373df0a0732468ae0. 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/CAE360800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99331777b2c4ae94705a3b16f3fef9c2da2e1f47ce255fe7cac439a34585fb0c. Chain 2 (Bitcoin): anchored in block 957745 (2026-07-12T19:20:20Z), 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/CAE360800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda43b91698e239f3d0b826aff6d5af51540400eb18f41690ed29d1340e806748. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/CAE360800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2abbce5a218700cf4bc56cde261117b5883ffb465e8eea660459b7aace4920f0. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/CAE360800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3b5ea3c395e68651c334cb1ddb4eace6a00ebe30e4706e6c65b1eb90781df8. 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/CAE360400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1536656708e9e402b8190d5be5318c9c398838eed0ea3c1e5ac3897e672ba5f3. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/CAE360400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ef4ca6be60f2f6a6bfa75b327f66771833814bfbe7ba57f7ca954f58b4432c. 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/CAE360400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ac88d244456ed311e586763443267923b5492d56ce02d0dc7e92173168d45b. 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/CAE360400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83046ffc5140139067e4c02e494784cc2eefe27384760f50dca33af3f52ed062. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/CAE360400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64158b23e02a52eb8710116b6ffa6578c2fc4ff568b5a39440787a4c33970e4. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/CAE360800048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c5ffce795a514a9dd6b2fd4f8bfe29faa854d8ad5265b53e71f3b0e9f6f516. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/ES8740711002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ee8545ce535f7d1bd312bf9278536d0a45511d0af52377129cd44ca38b8093. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES8740815213.