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 0x3ba54f6e3a7655ea3e883470ffb21f9142d9badc74ce15408fba558e36d52887. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e8f2530-9ceb-4c65-9c6d-f1b7535ee675.json and https://artists.proofprofile.net/proofs/artist/8e8f2530-9ceb-4c65-9c6d-f1b7535ee675.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 0x313ec0dfbde5834e038063ddb4a36707fbfe5b9b5357b45f82748eb8d6a30062. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/DKBCA2005701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6992b0b281f2247ca148e358fce765fc022c86e8881058120ed13b69a09296e7. 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/DKBCA2104701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ee5b09b863ac22faba4c396652902abbd4e6e66c8aaa566c964177cd7017db. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/DKBCA2104706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c09a7c6eb80574314732cd5cb2f062caf3a38c1af00ed0080bf8611c1efb30. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/DKBCA2104703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x913ec45aeb7cdf810f27501a033596bb1de5e0d749ca7b41a1c4c3cb2e788c7c. 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/DKBCA2005703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88d9cd213d38ad8e2b00c89504fcb742f60c576549ad12facff91c7a71c0ab2. 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/DKBCA2005702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd159a0fa5306a4f0ab61dc4ed0bfd9c786539e8dc7b8cd0ac1ba4b4692b7617d. 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/DKBCA2104707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaaf047f006e0b7440c2a48e5fb6ac9a57d4afa1dc5f6952bcc6a279a526239d. 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/DKBCA2005704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313ec0dfbde5834e038063ddb4a36707fbfe5b9b5357b45f82748eb8d6a30062. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/DKBCA2005701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0063effa39e76fcd927fe166394362c392545de7d9ae30dfa67cda27dd5cb5b. 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/DKBCA2104705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751d511c2c4a15c5ba38d77ea263fe20280b1e3593e83ba1b49ad85fe0dfff6f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DKBCA2104702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a272037200349fa25896719e142b1cff7e5a9564183319a22047f82e5a3d114. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/DKBCA2104709.