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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 0x9b4ab70b3b186204985177e1d56c4dfb0780a19838b6da1e435b78e2481352bb. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f1ff6f3-0a07-4c66-aab8-8fc809b79f0f.json and https://artists.proofprofile.net/proofs/artist/9f1ff6f3-0a07-4c66-aab8-8fc809b79f0f.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 0x64aab4b887aeb47c58b63fa0e08cb330cab5460cad7a7f058b97d2f9155d8782. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZN882346385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b5058fe75a186afde776474dba3b3f402a53e6d7bf8b42d881f2ff344f3fe5. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZN882359365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed73737ef53997d59c7c6b336855fcd0058b2ce326b36ab5f6e8adc5e090dcf. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZWDW2303504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050ee7cb670ed9a0687f57a9936db828688b9aa0eb101afe1e33be1a63183c6c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWDW2322365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0303161d2d02983ea0e85a3f58f144f42ae890ea0807797382e22041f7933cb. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZWDW2322367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91203b3fbfa8a7f50cf8e2b6aea137c450fd9f6d5cdcf3efca93347a538434f5. 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/QZQAY2413251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad3f69acbc576328e8b5b779c60174be59ccad44e467a84a838ab76d8b4b78d. 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/QZQAY2489934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e092cc2607c99350b4bb8fdfff5cc17dea82de6431751ce47b532188e5a5255. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZQAY2484628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676c8742b5bcdb0110276870c520f3b7bdc787e90d968f2fdbc07d32aa17509d. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZS7J2412713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb7e84fe6a2aeefd9240a7f96a0283373fe0a911ffa739f2e528a18c2ff1e62. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZS7J2417006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad3f69acbc576328e8b5b779c60174be59ccad44e467a84a838ab76d8b4b78d. 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/QZQAY2489934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8be313e3006ba22c041c3a3fc94ea76d92c59e685b2b163f530cd095a6f5589. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZQAY2457448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bff099148e1e1814dad87335f8cff4e68e3a8b68318203ac06bc1da8e917f0d. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZTLA2469175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91203b3fbfa8a7f50cf8e2b6aea137c450fd9f6d5cdcf3efca93347a538434f5. 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/QZQAY2413251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e092cc2607c99350b4bb8fdfff5cc17dea82de6431751ce47b532188e5a5255. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZQAY2484628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec95d322eac95142645eb78ccd619fcb173c87c70e7930f8c1887e159abc6417. 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/QM24S2502473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03728edc3f214049f6cb7b156e49688ca920927452f7fc99c97db971403cb14d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QM24S2502464.