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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 0x2f65ef4e7916c28ffc858d9bf174b2d01731fa315f8f929c4b1ecf56adfdb66b. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6db55c81-22f2-4c2d-9e7e-ac03acf6a48d.json and https://artists.proofprofile.net/proofs/artist/6db55c81-22f2-4c2d-9e7e-ac03acf6a48d.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 0x6f7ea6ace9b61817130d36ca3d92a6e6383ace10ffafd25b23926dd647532433. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCADF1712171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5985fadcfc2fab955623e10aac57a2dee174f8795016e1042348b9d393069eb. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCACQ1688014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd847e55ba4a990bf6bd8ef5c0d2853b9f8e976582e6c0e551c974dad10d96e. 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/QM3LS1800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74aa61e8adbc4a412b7bcbaabd93d309870811e2cb6f6e97a5afbfa1f30a746c. 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/QM3LS1800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fece51fbe7ffbce4da353fc5ed4e18288356e7509fa0f093b052f3231f4ce5. 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/QM3LS1800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313bb0733f0488b0953c09f3efad5b3e2d5c11479d28d50d8ab8e2a0ed76e7f2. 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/QM3LS1800034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a87b47862c79b8e6c1ee1679609c7261a79f049fa16b564db763458723c7dc. 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/QM3LS1800035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30cf0b6b7e38f0171b65f6c20df90c599d4722c918a504a151106e046fd483b4. 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/QM3LS1800036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9986c5b6cf8d87246de79f4c888997a17810600140b23f557148f42faccbdf11. 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/QM3LS1800037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b15a5eb5e5d0a10474b4a930789f624c435c4ae7fc6a73232268099c27eab86. 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/QM3LS1800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6767e85c7642ff6692978278c07535cc76350add2c9f4a66fbb6c726858522b0. 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/QM3LS1800039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda275643d65c4460159e8e6024e7de0809a53a754925c42838ddbe8c33d1ad2b. 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/QM3LS1800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa948a89b437940f6e454e4bc77b0479c90a6fb115f7aded068a3f71529fe8b. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QM3LS1800041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef28504ffc6d6c1a64caf5d43f7c133905fee505685085c66ef1c8ef51c8fa40. 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/QM3LS1800042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770818c6b939ac67dfe3f23ffe24b373b10630bba1bcb767faa121d087cda15c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM3LS1800043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7fe70473f1558c57ee81d3fc47d4f8f489f9a7e2965f6868a213a879f33512. 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/QM3LS1800044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b15a5eb5e5d0a10474b4a930789f624c435c4ae7fc6a73232268099c27eab86. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM3LS1800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fece51fbe7ffbce4da353fc5ed4e18288356e7509fa0f093b052f3231f4ce5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM3LS1800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda275643d65c4460159e8e6024e7de0809a53a754925c42838ddbe8c33d1ad2b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM3LS1800040.