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 0x7177c2664919fb65f267354581b7d4f2bca7e8d16300de1a410cc6083604fb68. 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/326cb95e-ec6d-47a2-9339-08ef81e749ea.json and https://artists.proofprofile.net/proofs/artist/326cb95e-ec6d-47a2-9339-08ef81e749ea.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 0xf011b89a79e5ec38b3c7cb7bbe7fc7401ba7be01e2eaf73376260c7469c5f1be. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USQY50908857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944ec9e148fe49a3a853638a2da9c9ef18d8e071eb3771750d1a8a5d03b7ea09. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/USQY50908860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef302adca57c650fcccdda5214a7580cdb8580a54dde4ecdae6ed957305cea93. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USQY50908863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd90a9288cfb3a69c909e29aae6b7a70241348034bd76c7c1697b0d3bbe6baa. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USQY50908865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7fc67800f2e956d6540f08bf8fdf81bc16476d1be373e3bc608e1ffc472f7c. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/GBDLM0790090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c718527f9be372f63981bbf22af3b1cf413f4a4c6c91dbe8a024b563b12571. 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/USA2P0502724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c22340f7597a9feff7711e107b178e16919b6c77d50d82f4808dc7adde6aae1. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USQY50907077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7653eb9a0b6f36ce1e9977c4810bff206ee94a05f339d9e4442ee9234eb5975. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/USQY50907078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37de5cdb73eeeb71de3f50c10a4dba4687ec43ef005569284bc36c5a2bb6c3c1. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/USQY50907079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9e22b5bf460477a0fd83c0130d198a740b1404cd145e7b0fba4e85ab50cb5c. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/USQY50907081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1381b820d0e18b16ed66ef56c88e95d6e9b844d1402945edf1100526d165c9f2. 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/USQY50907083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025f4ebdf5dad16f66df5dff2be5098b5654445cf119beb192065963304f5103. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USQY50929980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3b11481168e84f2ca663f448567d171ec49fa576bd4b7acc4de7bcc38b94e7. 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/USQY51784216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5adece54500370b5b70f745c8a64d0f2e318046eedcdc118d867f6497845bd. 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/GBKQU1590580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8514318e6f070bf53733c18b704d09e8034031c3795b51f7d93db5f9cac30cc1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USA2P0841488.