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 0xd0fa87b89d7e27e7e7c6b7c1aa561cb93a32ba89c37a8dcf85e3a004e40632c7. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/997d0ed5-dd63-4dc3-a442-58ffad1bcebe.json and https://artists.proofprofile.net/proofs/artist/997d0ed5-dd63-4dc3-a442-58ffad1bcebe.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 0x3b5f3315c046669844e73e483e61be3aa8f74983b257ac2ba7eb05a9dc77abcf. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZDA82582989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93617e8eb76d600f29d4e62a9bb1b186f3a23732cc17bc332de8c901d5f45c5e. 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/QZES92503427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa3cd7dd9659ea57d739d3dbab888368680bdc524ef8e2af79d83ca720c7fedb. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZMER2542568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1424ce03851e1ed48652d102c70e93528ee7203bee23f51d899f63d41c62ee. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZPLR2532635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512def3f444d4618aa00e095ff3000c8966b72721880b9c9ff54734a9b740f05. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZPLS2571532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c4d8f28fbadf09fa6f3b59826eed35e880faae65aa068101bba71e720786bf. 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/QZRP42538481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4a808e7fc8e93a999a92f6fcaf40bbd5041eafb18e46549d26aa193747c837. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTB92503312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfe5e3e44e4a50163270d2d32573264deb9f7f6adc1f5ecbf9455cbd468c6bb. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTBC2505494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52fcb7ed8fc9b0911fe78d49e76e419ff5d8c7c7f7cb275e3adfef6fe2d4ebb. 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/QZWFR2503272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e2494ece0d75d68a5f82fe287f8081791e4a9b794819c9378f8ed97bf8972c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ762505511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf5a4d4ad4fcf888f0c9fb919f14751ef23569ebb70eeecf2c35066275d1f76. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7M2585149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf405108df7c285e0ce2fca9c43a8dce23ee23867e848a0395eb6474cbd8c94c8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZZ7U2584676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427c21d86709611c059e3e697fbdfe36a31d6b173d02ba9e6176d46f1bacdd05. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QT3F32541793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16912b7c50307d2d6828b9a89230c4d9404fb59135ae27fb7292fbd841c9c5f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F82563452.