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 0xa63c3f274629763f38e9872bedaf8327d672b36846b2deeb49fe0c6fb0c6058f. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4286d1d-dbaf-433b-a4d8-0d0497b20f20.json and https://artists.proofprofile.net/proofs/artist/e4286d1d-dbaf-433b-a4d8-0d0497b20f20.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 0x4df36721ae6eeea9a350ceb6df92cb3491234fede10eebeb9e6f5f4b9b1fdb8e. 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/USA371005773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8092da45dff5a9a43c6a9881efcdddacf8d256cdc2d6eb8bdcdfe32c9a4e9565. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/USA371005774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0a3a78c9e210525f5de75c64fb3453892ebb640c89ae39289a34273cfedea7. 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/USA371005775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5d5f30db8c41d8b53df8ab7420dcab4bd962474cdb28810b909680d49fd74a. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USA371005776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe708dae64dcbcd1cc145af42b924203dd6767626e343de200db9d508e9d4a6d8. 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/USA371005777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55271e48f57230c894cc512e8a9b3f6d8a3799e04ac721fe4eed9db29485ab4c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USA371005778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7530267c14c0c2701257c68824186bc62fd88e6c3df0f5f13dfdd196c5c884df. 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/USA371005779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66614747881396e5fb8d1930fe2bb92650c7a2fee64e2f5ed28f583bc4ebfff. 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/USA371005780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb0589e213946fcb372442051046ef5669f8005630a9514b187d165cec1b417. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USA371005781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa345af55fda9cf83a0f12f6af6803a1446dab1db6e5fc6ad12032123e24de30b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USA371005782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b64c3dcc94ffab8985053d834d9a1a8e89cb161ac4a8dda8943a303f55c3a1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USA371005783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4addcf31c85712a87ecff8324ca8e18e69cb23b0ac026ad684fcf4a199965a9. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USA371005784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112fbdce8f3d1972d52e760178d6a7c27f3c7f1f44c2f1774fa4fafa13ed575a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA371005785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ad84a3c40c0c99fcf33a742cb30dc5896f37e4ff3d3ffd3fd88c7bfb4c96ec. 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/IEAOR0800049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b70fa729d7a0391a856d06f7abf4ea40b8b032d9d2bc0c08775a4baaffeed8d. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/IEAOR0800068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5725cf8883438dc3453111dfd888f523ef2896f40573dd1128dc6c38bbe62a37. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/IEAOR0800066.