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 0x7e81527507b1f1f5283cca6245dcfc4b494a89af3918bfcab3fd0dcf4f6f0b51. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/219f007b-41aa-4dc7-a8bb-05f0b91a0bf1.json and https://artists.proofprofile.net/proofs/artist/219f007b-41aa-4dc7-a8bb-05f0b91a0bf1.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 0x31fc486c44aff61839f50dedb1a4559491613a179328c62553b63d9ac0b820ec. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/KEA9R2400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4312e882e724381442bafa8fa9d83e0814f52070c20c0df3d82301a644873578. 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/KEA9R2400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19bf6b51647b0d1dbf6528df1c01d927f418c2674c19a2777139feac29340611. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/KEA9R2400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89142dd6835ea0b8977c0821d7030de905fc61fdc400b0c693eb6ee0697bde58. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/KEA9R2400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2a0ae73013a05f9642b1b0557990c3b69d6118b856ff2f4eff10d68d452bc7. 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/KEA9R2400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42c1871f6f78ee4e2a52f4132d954e7d89dd978b09d40ffdd75e66fabaa861b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/KEA9R2400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9237d350321a2143b219758dbc347fb9fb6ac93fa34bab345f2e8bc7e0cabb. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/KEA9R2400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5755efc9306726da5ff67789792711244ec29f1771f23dc6af085815cef53891. 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/KEA9R2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f9dd3083c4534d46956e24a5d338abf4dd31cee6005be01f6e981635b1fe25. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/KEA9R2400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54159f05261af32456c27169745e15a9e0412dc5dffd6c78a5156865bbee5ab2. 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/KEA9R2400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489835254aae1b27fae6c05b76d77c753dece181d14f131a865397e3221162f4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/KEA9R2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67286f0e9e37f7285910863951c0931c13098395f6f275bb01cd0c0e50bf806f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GXHAF2532922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6dcf3752ef6ea1ac24f951510e32a0bd0b5dd706f0b4052cbfffbdd0c3d77d0. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/GXHAF2524983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35259faaf57a5b64af054df265dc70669f9d46fb652034c8404b04b817d954ed. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/GXHND2551875.