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 0xba5e5f13f80d47461eba3f7cafa11cae0a19d47ec71dc34a6cfbdad01163c4eb. 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/6de5d6e6-3eb0-45fe-8f9e-192e47a1d297.json and https://artists.proofprofile.net/proofs/artist/6de5d6e6-3eb0-45fe-8f9e-192e47a1d297.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 0xb37c82b3dacaa6bbd4770f075e77b1c6d9f33036845c3a5a962b0224265e103d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFT2172466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d26e806fc6aed7d326af9b127f792fff6450e624ab9e160e5013739353c7b1f. 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/TCAFT2172500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08a9dd1ac6cedf762e4f47773e8a81dc451c6c11a3fa925590a4571ba1772ff. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFT2172510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ad8754fb3d23592887820b8726d9809e3476ccb51238661bd85ff5b1967837. 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/TCAFT2172530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8839fc2c8593d1c97c584d2bcd2e4aa08b0ab4203a8bd4ae854568fd26b38d0a. 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/TCAFT2172534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c5e20a14d0e58b370c9224f635194d35fcdf4d78825f9733cf08ab3a79ca75. 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/TCAFT2172539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81eba5e121a9d5ac85512b073b0bb063bf2486d8c3ce00b5893441dd1088667a. 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/TCAFT2172542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae67471ea5146ab2d2af1732ad997fefadac455f8d5cc0f23893fcbb7b985863. 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/TCAFT2172554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b279d47468013145ec6737e6b2931f2954baf99cfb8185a9d6412e5c09b99d. 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/TCAFT2172565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe068cf0b4454c9599abdf851e9167883412f4497b2a7c907d43840642b734b65. 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/TCAFT2172569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378b4624ea1e6a3225901147215ef9aed91e43650d55826aa7f3f883f4cfceba. 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/TCAFT2172572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915843a9783999f5d97f593ea33e3ce299d0614bd029d5cf8b38df0b57a849a5. 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/TCAFT2172575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0203248e5c29de4e8fb43dfe5b6c443d6e62d221a3015df56f4cc072955524a0. 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/TCAFT2172580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d95f863f828af7a7942deb30ef7f9304e7c75d0fb696e0d90782fedee9dcca7. 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/TCAFT2172584.