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 0x269aae273edd630f0fa08f308ce4a37ca2e2d345d73503751241a38a38211e67. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b2b7010-ba91-436b-9cf7-de008bbefa3a.json and https://artists.proofprofile.net/proofs/artist/6b2b7010-ba91-436b-9cf7-de008bbefa3a.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 0xf66aa4766a8cbe82b9e479b9260d72b4560296413af46d47accd4d282ef6c97b. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBKQU2005263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41059dc9fbaa283955e8c2cf55a0f2fb3e862760cac30574874d322a5d53bc2. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/ZAFG92100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb365e2429b36aa218285b76fac5151c61d07da7809a64594c89f21e99f7194. 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/ZAFG92100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e4775b5e22e39df48d3cf94653ce2427cf2618feb7476b65d0f1ee6fc457a3. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/FRX872119087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6725646cfce7ccd5014ed24c49db8589b48a790dbdec20818a6a4580826caec. 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/ZA56E2100674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748de12217040f907e8390de0d7bdc02d08006c23c292f0913664a995ade7019. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ZAC012100622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4a0d51f898cbba47fb187aad15dfce07859e0a2831a2740527f1c79229a383. 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/GBKQU2366930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55942d273bd5f6a7380a66d944d65e3e7525cc54bd9ff074803c37fd774c1741. 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/ZA88Y1900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01dbe420d90513ee25794589ba1dd9ece0f950e06e9552557d64e5e0c5a753e5. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/ZA56E2314947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2873d702d3a0010b7644d1103e8f652a0097a461cd070f064da93a9ff9b3f2ee. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ZA56E2003343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825784f8cf2f9a63e5735b8cb1aebe9ebbe4c48713939fe18842594253548d0b. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ZA56E2003348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1e89776b67ae31f8b60c6f1f8a8c8ff27eddac618f51b6b5cb797c813c7b06. 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/ZAM142400198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22232f21f8729b5687ceb9ad00b78d300c63182d04be96ccf065d201cfb90021. 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/ZA58Q1600219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f383b36f80337681333f1a2821030e32ba66eedbaa21b45bc41bdbcef7ebbe. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/ZAIFG2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea88860355af05432d03a3e837ce595ce82e6df3c915365d39bc195d3d4c54b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CHE192200002.