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 0xfb92ea748eb14e5972a0de34662872bfa87e1eeacac72c86840692278ae4f9c1. 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/223b7a91-3c51-4bdb-9eb3-dabeb5f0eff3.json and https://artists.proofprofile.net/proofs/artist/223b7a91-3c51-4bdb-9eb3-dabeb5f0eff3.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 0x0e5cc345f6c9270d36700da3ea3555388635e8b6dc05a3306c73a00686f1d7a8. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZK6M2337828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458fc5e1f0aed02ea4bd17aa84f856521664b059845c9936d3f5441eb8b1f800. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QZTB92389898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c41a4abe6b30cfe6654238673cc2fa4a189c025eb9d2ae5ec180dd797611e0. 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/QZHN82449294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4da233247b42329ae958888d55ff4d935a55025b3be31fd95b2dc947608e6c. 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/QZNWR2426486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e44e6e2896d4598071d9ca0fdc93900217df8cdeda731a3eb3ee92a891dd62. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QZTB62443583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13436a1c003a7928ac5da5eec90cc627fa2e9c84576523b3662b7217075cedb1. 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/QZTBE2415352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6cc8c351b842ee720beb9e7b9265fe7f51ca2f9fe4323ee165f2b739984c47. 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/QZTBE2415353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88ca89f924fd533af24149dd78856209c549b2c52d2ea8564e99942cf03f151. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZWFG2405531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208f3cb447573ee8fd1d6058a7de87560db61721fad10a00cfd6628662a78bda. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QT3F32449321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b4af857ca51d225c8ee4975f65caf783a5e19bedb40a2cf83b02059c40a7ba. 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/QZZ7U2404007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f12581f0bdae8deb9cc0b8e02eaebf0e399ebd6cd7555c97b205ca96bd2cbdc. 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/QZNWQ2533472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d4690b77363595f9a071c8752e8b5304fa2ae14b4e2fbd1d34f99cc879c65e. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZNWQ2533474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91660eae1278275de998785590eb3e9c568cfb84f280c904cedba00ab5e6c150. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWQ2533475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429adeab713a2bdbc277144f820d8fc77bbe1d79c56c6261c63e3c82f049c115. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZNWQ2533476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80434d765b07791ad6d083168047d1b1f4bf876c7b1704a5e1210c9030519a1. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZNWQ2533477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00aafa479faefeffe0a05beaf012a7e047c92ff9b175d2b0e57e59a00bbe0924. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZNWQ2533478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bed94b595f6d813d9e87f1bce564549cb78a96b22fac49cea39f01c16fd3351. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZWFJ2526557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a23728dcae6ad79f745eb0cc2d5fd1c7150354142ed63fe6bb2c5770c97e53. 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/SE6XY2332230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64be85e697f9ea280cb06bde68f775df4676e63fcb530ac721793d813d00323d. 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/QZMER2415509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243fecda132f5c2e3ae01b82178741f9f39af438d1ff784a496e51ad6568ac56. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZWFR2320424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d3608578a9dde79dcdd84b957ffd76a7bca45df5fac41c57a26ae1deedabd4. 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/QZMEM2394345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aadeedd083b4d6ae3f4c612b3e0e34ca07d43c02c4d648b81e2ca9f573f9fd6. 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/QZDA52570209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ccdf827471a9117690ce82f8852ede90dc628a74c839db4885613f5d17b3fdd. 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/QT3F22445649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2980f57af53bae5b6c6e2a677d467791def324b301a1aebbec1fa987ea7832. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZZ762444567.