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 0x76722f2af9edf4dad52354ddef7191989b8f7c60149e7d974dccf656b184d04c. 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/dd0b1a41-4377-4498-993f-cc0347f4272f.json and https://artists.proofprofile.net/proofs/artist/dd0b1a41-4377-4498-993f-cc0347f4272f.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 0x6ec024834a8fd7161693d14aec15f61ee87d04c05353fd18204d21ca62c578c2. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QM6P42509732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c937955bb790f46f798d2e521bfc51edc8557af69d65a8c54301957536543fc. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QM6P42509733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84598ee24029820ef9c84540522088f4594d54935442bdf7d18bce628b6f9470. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QM6P42509734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c760debae8168cd5bf2a6d628fc5436906f4302338f1272bbf84d178ae7b27e. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QM6P42509735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc45a7e3f16782249893d4f3df38192e93931d724d1edf48b6ec299efb05614. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM6P42509736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642f78a45c0fe22f5f557d2766221de2b6bfefe181d3e7afa8c9585ab0d7b2dc. 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/QM6P42509737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93fb8add87a5f7df758b8f8660d6b39574a6522156bf970f38fb2ae8c3dd2975. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QM6P42509738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf583866ccbe343f19f67d924f75f9de68a9d188d562ba6a6ce1fc13e1cc1a0b9. 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/QM6P42509739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2464808966b10ad9dc806f9dff98b5a9d75c02f6ae49967273e521f81257aa. 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/QM6P42509740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ccbe9f53bf756d0cca8178ace572ea4352ef63fdd4e9b31bafe807990e52c15. 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/QM6P42509741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009a87e2a16dd9cd8d24d053d86c6b50a377366572446499a219fa58cbe03e6a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QM6P42509742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786b5acb62d05231e8671835d7bf911049acafeadd1c1b1aa9a765e37c26a1f4. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QM6P42509743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abb5a47897102d3c68e65a2dfc606da2aa8b70c26fdfc7586257b9b9465d9e2. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QM6P42509744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002731fb3c470097f0b8ae93a19a0da141425163af42e3b13a042400142e7150. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QM6P42509745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef6f38193bcab3b19c5d84d1fe31d7d3f4c55809197d7a5f765fd2713c4e7a1. 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/QM6P42509746.