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 0x705faa57e265fb405dceed3cda81a204569949fe035a02659c8a442789827d1b. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8efc6928-9d11-47ca-ac31-63c9bbe26c9f.json and https://artists.proofprofile.net/proofs/artist/8efc6928-9d11-47ca-ac31-63c9bbe26c9f.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 0x8be7e7ee6fcab276248856893b87a433ee87bd861a46473d91e24b30ac995d7a. 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/QM7281910520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe311254e12ada87e54600b3d4f4ce40e524359d27bc067327e2e874f3fde2547. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QMFMG1572615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6226eb866c98513d083558a0218ff1e658d30614a3b5027f8f6d5821ffb410b. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QM7281911090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca4ddfa6504c25df1e96622e86506e28eb04ba2ef03fcdb8d90a85360a065ba. 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/QM7281910670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658a17aea77d6c07c6c76e646c32ba1ea3a9955fc4610b7385d8e0c2d93c251d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWDW2201091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75435a3c1cab3fa4a93192e85a1fab5884b6ec78164a4ce8bed63d2f849138fb. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DGA052333335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee53546ee5aaad4b0c6ceba0da47ddc9ba0a9a946cdae9395a1d814918f5613. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/DGA072484182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38956efbebac5fcb7b00032e3c28325784fd8e628ed4b98f79ed8afa1e5c02c. 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/DGA0S2499291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02c8f531d20298f596e26a68b0139c942b5a66512abb62da416904a2a9933c0. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/FR10S2508196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169120e244d1720dab44026cd7d9a851578b5f029a03de2baa50212a2857187d. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FR10S2593899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbadc2461ee5ee83b923a4e089227d0c3e6ca85bf9c6ccc853472469cfb07cd17. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DZA102501074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc660d645965765038dd3a44920c29c3f19e02f7da85ea2cc9532282f7e6918a3. 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/FRX762523044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a62f1a1b8924af1e10f22be4329277cc48a925b531804c9911fa6d43cbd6ff. 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/FRX762515930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87db2f0bd64ca8994543481a86b85c8aeee289820254ffcd7cd7c6b1a9a9863. 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/FRX872514378.