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 0x256c2b00ccc3680942c0ae762cba079bd77066d6b3befafa988c0e4d29cb5144. 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/4c77a23d-a750-4756-a77f-9fca727d6a87.json and https://artists.proofprofile.net/proofs/artist/4c77a23d-a750-4756-a77f-9fca727d6a87.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 0x2eb4ddbd8174bfd7e6a6a801699c7d5379ad74d74fcc34f0119f3908f6252ff4. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/FR6V80908051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6dc6de8955ac9141dd7e6b74d08e17484da75652f50312ae91d72fe8a534a41. 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/FR6V80908064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3486dea7f3bff60c09dd5ae277de7c347b173de538e0d1c0212628aaa064df28. 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/FR6V80908066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b73f802ca6ec1895f1c0663e88bff1e2b50c65f6cce7a58412fbd3c017184a. 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/FR6V80908135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a293c4d7ded16b6c138e5ccf9e18f50f1ede9dd5acaa7f7f70a74f1b895e7c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR6V80908137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c15bb268ef2744cad4f58cc18ddeba25915be2dc47141115f84a41017d0199. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/FR6V80908146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf471af826a912760060afda01a771ffd31b219c0f856e21f90b5a9fe89664e2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR6V80908111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef67b09aad7e94c88cf540febbb68447da746ad51b88fa94300e34ce9d1af30. 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/FR6V80908112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ba8fd9cf589141f0975d3691154258615dfbcd1a257ef0a8516711150f703a. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FR6V80908120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2b1796914c91625c624305c30a85162aae6c59f930902f5bdb7356ace73fdd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR6V80908121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf202255dd06e389bcaf1f1cc3b62eec0d988643f1bead80d56663ac26361e0bd. 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/FR6V80908125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83f290ac2be0502e0421fed82deac20d9109a68d132d448d713a3ab54b67abe. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/FR6V80908126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31888005b223da417e220f8b7cdc73a0179f3ccfce8ba85a433cfba5ddad602. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/FR6V80908128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193ce84cb901f19a174b80eb86b2d26e1e5bd4bf87a7f41ad43933c6eec8d91a. 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/FR6V80908094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432a22b50da2fecc12f0264adfc337e7ce314363343577c75767ccb0e0f28a75. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR6V80908095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae6761d64e393e0fc13875c7158419cc5570fd47dca449c5380edefb6d54e1c. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FR6V80908104.