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 0x46620e84ac676096fabecc538f333d23353aaee6b4b2dd7ac35c34d6f877ad1d. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/266d30a6-403a-4569-85c8-3ad3f2e06083.json and https://artists.proofprofile.net/proofs/artist/266d30a6-403a-4569-85c8-3ad3f2e06083.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 0xd4a9537177dc938f620394662a5e1578652484f9edbb136385186ae557436417. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNMV2425992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74a7bda5a988639b11708bcfed5f8b037c444046d35778fd224032a22ee8397. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZNMW2447356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a9537177dc938f620394662a5e1578652484f9edbb136385186ae557436417. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNMV2425992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80fbcffb20b13c2b366e9acc9af2471431dc15766a61f68b0d47116e08757f5b. 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/QZNMV2424936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe619b7a76bbd38c59bfa2209cc378dc1b3d5ccc2eafaf97f16ab639fb2f428. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZNMW2447357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03323a7bad683f9c91629c7d14dbc2d96eb43de27b033d48258ddfe5075378b. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZNMV2435116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85f6e23899deb6d01bb175d5902c2547b9f91116428dd1021feae94dfb5c7ec. 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/QZNMW2447358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1340bec1fe22a095095f16ec4c9d8d3d8cdec9d0b3acda42bdae2529f35af766. 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/QZNMW2447359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847c75aa0093854b5b02cf3273b19160b19608787f04204ee8253b26e907c4d8. 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/QZNMW2447360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d97fc7719b28b86c63e6ff622d746924b57fd2a5de4cc04e475bb9a172c2686. 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/QZNMW2447361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb77ac903d08e6c3d667a53cd606d6ae2d3c17cba31530e459521fbc304dbc8e. 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/QZNMW2447362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7054174c7c6ecac23f00858d25995feae6147dcaa3a366ffbcb68fd36d1bae09. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNMW2447364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a387039e0eb2aecda42a2ee58a2b50ac062a14fd3e11f49aa2633309d27742. 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/QZNMW2447366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9e3c43d44d4ea377d6558b1f81d6cd2aa440fa4a128fb5d918d594ec189438. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZNMV2424946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b0200d87caaa36de40748e37149a4c011cbff57692e9e5950296f2be2226b3. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNMV2440678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823472783872a68ef5ae04dc8067aa73c66956af081539c6b3084abadd0da65e. 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/QZNMW2447367.