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 0x9c5ad36edd17f2f795152a93dc3fd2d60984c808e70c47852a3a5628d975a736. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0a4f98c-f52c-40a4-978a-f5b6eed3f44b.json and https://artists.proofprofile.net/proofs/artist/a0a4f98c-f52c-40a4-978a-f5b6eed3f44b.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 0x5433bfce214fdbacb811dbc7fdb26cdbc9b19e3c367e13fe9d3fe0ec733de45a. 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/ES71G2429381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5433bfce214fdbacb811dbc7fdb26cdbc9b19e3c367e13fe9d3fe0ec733de45a. 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/ES71G2429381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882e954d7ee45b586f916ce792f21aaa36d03057d5911943dd31473654a6a9cd. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/ES71G2430287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab0b2e6aaa52463456a4552d78da7f105f8dd28de8ac62463e2fee15d553f0e. 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/QZZ662355197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8d4a84132226dbe0f7e4bd8f1b371ae2d80d406e5b1fe80a6d3f543f1bb68b. 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/ES71G2415385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a43b17ff08e3af6b0604a4363d7201aa6e0b11a3c41fa8a8b90095c324a5554. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES71G2430286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952ebe72063b5ccd8ca8827e0768f9082b50ae3d06377fcb7ff515fa505afae9. 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/ES71G2423729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8d4a84132226dbe0f7e4bd8f1b371ae2d80d406e5b1fe80a6d3f543f1bb68b. 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/ES71G2415385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8fe70c4522d1c320826cdee888dec34dc736dee980a8df11b3c005055b7c7d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2433497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0570cf69261e2b0c6db32557cc29e81c3081e2fbb02c473634f3308406fece39. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/ES71G2505200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499775e49523bee9d8e20c1dd9cd30174fc070de0542eff0d6c5a92f39fa5118. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QM6P42557972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6946b087e93899e22370325f09eaa8c6b7ee0c8b2e28af52f045e130af5b0ddc. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T05:52:24Z), 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/QMDA72517020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14691ea23eb3e6048a6c2cf8e0f6729c6682b2f88e78be4c6668e5d5a85f77b1. 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/QMFMG2528777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc94aa67504093846e2836197ea623880536b4c230958f0a7068402f7fccec1. 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/QZGLM2430456.