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 0xd7dda868e575ddd5762794b9071ae58024db2d40d7a11dd42e2d45470f0e6d78. 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/5208a631-06f0-4dfd-b285-8790a9901b2a.json and https://artists.proofprofile.net/proofs/artist/5208a631-06f0-4dfd-b285-8790a9901b2a.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 0x8bb8638fa1d35d1dbc91b60d6439c9cd4876aff5d6a88a3f6b1764a69ce6acc9. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/DEE820100523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43a83ab4f8e3489f8e53f2236c239ff3637bea70a7572b1eaba45cd151ee782. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/DEE820100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb8bd851593a4ecca0c8cced3e0fb38a1d67eb3d6872ec466249706c3e2b641. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DEE820100527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec0afe5534545b21d986500cc77d7cc1be3918804c37f873835146fedcfe1df. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/DEAZ30600180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a426ff176f75213cd347ecf68cbb789457bd04a74e1cca105d16fbd5d29cda3. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/DEAZ30800558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f14658a5cca9ae4066ac2e658c9b7567f2d1ea6afab4942d1954a3c8426d141. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEAZ30800570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb267fcaa6fbc992968da944feac6ea24a05d4462744164de1a33c72bb2fa27a4. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/DEAZ30800568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ed9aa6800633400f56cf13628d8990604a3c8e5c0ca00cd2f9e9ed3921af56. 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/DEAZ31101126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40f24d8ba6c357cfe217115642b7c40a720b2ac686c3ff6f1af6183e9c84aa5. 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/QMFME2250020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46f1893b03d78dc23bf031d02a55204c2a65dbd146e295b0ad5d62f812f3a82. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ES8741502104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aacd9fc674c80cf6c05ae5d575cf192e1dd3fa5c092fe41c03c166285de88bd. 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/USV291406278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe970ebb8fc18177b2ccd6dc62443c3a85082c761cd88f43f16fd0a2c47e80d25. 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/DEE829820330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd126bb343d786223aa1e298f9ffa531bb46e0f40994808915644827fa2d3987e. 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/DEE829817920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c74de31d69079e102d78e010600275ceda2f691bb2312f313164ac36c871612. 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/DEE829817360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd0122a1811376bfb9330305bf093cde310f446ad47c7b7b313c1d3ce563471. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/DEE829820300.