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 0x796a4a486323d7d8e21419dc8abfe578e9a5ae0e0f8daa8d30382a3998113d74. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a99e6b2-e406-4144-a8bf-b1a54ca31618.json and https://artists.proofprofile.net/proofs/artist/6a99e6b2-e406-4144-a8bf-b1a54ca31618.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 0xc0c565bee7e44f818929c34bb2682ee4fd176c0b582f3180a6cfee13f814f17e. 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/NLL8M1800296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a0f31a3d8d08f898b9a0e823afa3080b4601d897b4db0e669fa3c0cc3d534f. 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/NLL8M1800298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b5c3936fc7c15f9a007a43d4135e7304829a004d9c575bfe55d383d8ace7de. 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/NLL8M1800308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a19aac3c560caf05f066b4c68e3579c089663d085848e855ab57a3d7cda5f7. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/NLL8M1800282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342e8325387c4aac8c6ffb2bf2f87b3b66dd6705276a17220ba6a27ea6223b94. 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/NLL8M1800284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2f8a6dbf4a385389a8e5e8b33d9bb4aa9475e9b274d83ed037d5723ede1400. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/NLL8M1800290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdbdfd2f62b6c6e590dac525d7e3bc1f186248fc618a8151456b3779006d7ab. 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/NLL8M1800291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72353f89370a90bf3c69aac5527c1fcb50be92455365524d162d67cc3a9a0808. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/NLL8M1800294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf777b03514acfda30427cec14d2e663e5e58c84b1b07133fb3ee71fd0b18ba4a. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NLL8M1900932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73548d2fc0ec1bb947d55a58abdd2c90a01ac19d0a8be4d38557168173b8a34. 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/NLL8M1900938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bba1a31acae17823e382b409100f93cfcc75299673438b557fc88f2d442b1e4. 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/NLL8M2100321.