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 0x398f895461a4d0bd494d942d75ac8c25bfd49d880c81a27527595e39a7260237. 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/202842c4-562f-44ed-8983-b15afc9cc06d.json and https://artists.proofprofile.net/proofs/artist/202842c4-562f-44ed-8983-b15afc9cc06d.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 0x30629ed94154263e6a9bfbbc127c661e32c4d902c2af30722eceb093ea3d1e01. 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/USHM91298797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043b8a823f98083113b02c8a9af4225aaccd0a66586a21b53a957373ea33b8c7. 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/USHM91298798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5cf15ffce78f543459f978091b2b8768c3ae6e3aa009d02f2f38cea56bccbc. 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/USHM91298800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f4675f4bb4b4d0c9f79b767d0cd9b724478dad3973e6c3bf2aede25d2cba65. 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/QM9AA1589436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91cf417a75a5e88dc1ec579979cdb182d5848e7f7227fcbdd5206ad1d8f4c86. 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/QM9AA1589438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa52775ecf36696154eb01e4c1b8037d59d63294f631da5a099018bf5694e20. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QM9AA1589441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081be1661ee7060cb0dadc978062cdc6919cec7a53298f691d8a2e482bd4ccef. 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/GBKPL1957869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322a8dea9a54d712f2955db9a20c565a39651c34dd90cbe0d1bce40f2642c5fb. 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/GBKPL1959499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9826696a52e9905c4e0d33f226c10a1c99b27aad99dce6bb358c3e7929a6124d. 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/GBKPL1957996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34731ad5fa88a1004e20cbb35b87dd2ae1620125841991a4b5e7370ebb1c42cf. Chain 2 (Bitcoin): anchored in block 958677 (2026-07-19T05:47:23Z), 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/GBKPL1954095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942c82fc4d5466afc77caad1a0c54020603802f33db559431780cec1db793160. 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/GBKPL1945443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57cdf7be6f74f91dfccde5b48336341a9aef24beaf3e62f9e9122ca428a97f9f. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QM24S2011841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58725473c5ab46ef006625f9dba8e402f78ee162c851a3aa94fcddd27d5c3c0f. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QM24S2102478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d1df499ab55315088da7b034ec5cf31e17c31badd1100651878e1d472a47ff. 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/QM24S2103699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f12d6e81c0bb771193c4dc63d491c908aa95f66aa32d11ee0d4ae22235d92e6. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM24S2105774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9543e358625bee34add8366670fb24275e16fd13d2b07a32b8c8659c606ad18e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTAS2216132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698c9f0bf366944cc875da2406a5938372de4d7ad427d9b76ed20527c29ad2da. 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/QZTAZ2285561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e07e123b13dc1a4f71642e645041dc484380f92637a2b489949296d2fdbf37. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB92236714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5b85c162142a82903f8b2a36d49cc02c2098f299f0607c3f59578f87d8ebeb. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZDA42305804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ace0f064feafe5d9e6e0f0bcaa0150d1732c854160c5cbbca1376483ddc7e9. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZES92339927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74286b61e5d777797de50ae8b6a59dfb1ebf733d74f3976d704803ded662660. 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/QZHN52369141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1198a79722f83cc67fe038544950c64d3ff283b62fc6324b5ec8e56fb93bf7f9. 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/QZK6M2349259.