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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 0xa3e6c26d6700739ad1c251917aca67575ce96b3192bd4d4db9b6997c817b53e7. 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/a9b149a3-f690-4bab-8d27-bda3034e82b1.json and https://artists.proofprofile.net/proofs/artist/a9b149a3-f690-4bab-8d27-bda3034e82b1.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 0x41d0b005406ad442c3261a2ea1f0b7910cd7cff86868ac057df7519e7ae92814. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USDY42090487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37778918c70421fd5431f5685f6cd393ad3cb9bcf932ba14b92dc6fd0a07e829. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USDY42090488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cf1db7c3a089e98aca3a0c1348935d87ebc4cf2da49e17190f68ad9f4c3b2f. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USDY42090489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7431e7d7fbab12016698d6ee6d95fc5976b3ca4e960717af52c36b3cc3e03a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USDY42090490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a8ea6d6d1fac0013f0f599c8a6a7c3e5f09e8eb4f88fd1f38e6665570a1a24. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/USDY42090493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd0ea7fdad1791b85dbf6dfd132e92719c78dbf6b296fa49f534e7573c19226. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USDY42090494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26038bf67c42ba747d87597fa27aba8caa5b70b83b1c4265687204a340e304d8. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USDY42090495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbda6a021f1b26c57edf8f95df9bd2b6557b0b951527dd08c9504ecd24ca98d. 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/USDY42090496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4725c612244becf0462675dad21f808c9fc6cf5f9b44590e968ba19e181b908a. 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/USDY42090497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fdc90e15011fad1dde8fd6303677e7d050b67dfe72ca9ce3e5be4c0f991256. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USDY42090499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef0bc49e2f896b981844640625d9e953515a43ca5ec9d56ee2a355afb0346e0. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/USDY42090503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8041bcbc503ee704a2f195a55b8419cc0885212e9b14261360f86e2e575fbcd. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USDY42090505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ae725585294c3fcc8c349ec72d3b6808e59955f1f095e010a5479b9e1872b4. 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/USDY42090507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94949b431c039d8156609b627c08c0d7a65f66b79c7357a7a6fec61fd228bf06. 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/DEB639804326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cab4fd59cbbbd32543d75cfe5152e026d3ff4bf25663ed8905b9911a63a40a0. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/DEB639804327.