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 0x7f81bf1798d90be9b50c468c9baf6b56718dd9ea5df2a5d190b895d853f66ae2. 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/5f0988eb-4257-41eb-b66f-47a9de898d77.json and https://artists.proofprofile.net/proofs/artist/5f0988eb-4257-41eb-b66f-47a9de898d77.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 0xdb7b494116bc516590848286219ec11b5af469ee861ff6de76771ea4c58118da. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/DEZC62109120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdb1fec82a4a271fda5e0d25ca37e45ed643d7d1a80ea81ac2b428cc0036595. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEZC62139904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2992abb271818414329c5a29ddfb08e9428fbcffa794bee63189402025fd5e27. 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/DEPI82217052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ca2c7c45f4868698d1a01890d699c993f0336ea42bdd45177880d34f105835. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:21:19Z), 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/DEPI82308838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5be9aa8d260ad01cd2fdc2902651fc62a6802bd7c90e11421ebcc4412703c2. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/DEPI82401615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f58af06b50d046822f5692275e3fe026d042c27580a7cc2bb3232207f9d59db. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:12:06Z), 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/DEPI82446947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce290d6645dfd18b7ed6f82d58f29f6dc116568076789651c4d671a93c1d7d0c. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:25:51Z), 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/DEPI82446946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90cc4ab96afe54f6e53f58ed8fded5a260bb638bba3ef642b2393f2ef364989. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEPI82446949.