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 0x371ae1a63c615b6563e6b9ec905662deb8cdf391c2c771e97cd00cc77620328d. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a0fd258-7f90-4701-bf0b-9f3c42a461e4.json and https://artists.proofprofile.net/proofs/artist/3a0fd258-7f90-4701-bf0b-9f3c42a461e4.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 0xfa0426d23c48a24a9c4aab9452e58b6e261ed6696fc10815a6f787117e996d5a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NOCVC2275010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3c4801806a98f0e208507efdec836d7f2dfbf76880847bba1b3447062576f6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NOCVC2275030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27dc582a57dce76bc85b3b7cbe259428036eecb89833a03d5297f2082059483. 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/NODAZ0505020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91255c302dcd5a68edacc5e500c461d8890b7cf95693c7af6f50f6e2fc1907f2. 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/NODAZ0505010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391b1d696c725e67a648c9265341d9e99de0f677ad8075cce91798393d2a08a1. 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/SELAA0300111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7aaf3f07f0eaf4c77ef13304f35a5497614e56245a9b88d45ca9160e026562b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SELAA0300112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b59b6396d9ab2ba2b5e57290ffe76d20affdedccf6c03961d4c0f13ecd9e5ab. 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/SELAA0300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54265f83aa889587d0cd52d2b5da19048521f6838ccfb8ab2b4fcdc52121dc2f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SELAA0300105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9ef5384ae10c96fea0e258152bf6a0f90dc51b13bb014e044806009fc69576. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SELAA0300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a2b82fb24a705cfaa298f0b68ad56c8d649b6dbbd92d6f357d949d2a41140d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:37:47Z), 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/SELAA0000403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5229f7924bf0ebb2558316b3724c30ddd4bd1071eb63d0856892e7306bc13067. 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/NOCVC2075010.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1f0fe9a2703d05dc4b394a85d5744ff1d8f664379cb8cef866257209e59e6d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NOBEC0501280.