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 0xfd538a30639c92860ad8bbdcb52c87d65438549f421ff6e03677122df3a25f35. 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/8c2cea65-1c59-4f80-852d-ef1402a4eba5.json and https://artists.proofprofile.net/proofs/artist/8c2cea65-1c59-4f80-852d-ef1402a4eba5.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 0x4b7f93feb33c49fceeb197ab5b8a59e93831b7fa905cc52f9fe14ba6da90ff05. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/TCAGE2278764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc655ebec6fad46672c041ab413c563acd249da2f2cb92fb900e48dc53067b1. 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/TCAHP2330815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5b7f683da9be216a6c9c00e752b4a7261f42b85505c9a938bc47e13df15ccd. 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/TCAHP2330821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7130d5f2c89d1702f905df394753a1de8d3ddc003df8b8ae58dc31df235ee9. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHP2351356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854b70783f2850a7b9df4d6dc4db98af94a3a578d6ba527e21de81f4b7e89f6b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAHP2351357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a109fee918c25bf82354f0714824fcfa76f8d1d0c3fe9f5fbf48df5466e4687. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHP2351359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4517758f27b24bf896483291a2e1b8fb182220537f49cfd13628facb1a62ac38. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAHP2351361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b154d937b436562be69d06dcfe67a7e7d21be29b47e43bf68f483fe5eedcc7b. 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/TCAHP2351365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae845fd4c1e7e75870a52e69c5dedd5a4b2ffb9e67e5d0bd5308c2cfb15863f2. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/TCAHP2351404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14ccec1689dde62590769a5151dfb3089f873b31a6740399fb3846a844e1dc1. 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/TCAHP2351418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb8f9d18a83c3df7ac7a31b8530643884f63c1a8a55019712c9187b2d5b1f5c. 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/TCAHP2351424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70795e15b321de112e82274f4db3e95fad80f109bcd0b8e721101d8d1949921f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAHP2351431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f69ce3977a07f6d22cc18c4b986960d96205f33306bc11974a4a9fbfeb081e0. 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/TCAHP2351481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ab94fc52746b1869fc899f94c38c6866d6f160cd1a011d101be5f3bc22ff78. 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/TCAHP2351486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418b0b0c7b9016f5f8e9bd2a6e55db475fa48a2b4ba731559c3accd4197ddecf. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/TCAHP2351488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f469dee679a6098ed8511c39281317d0b776199fe14a3661a42628298fc08f. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/TCAHP2351490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be81277d43b89f22999acdcb3ef2866ff644e698a80da30bb8e97e97fdf8f36. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCAJF2568141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb389a43ebd3caffabf028c41985ccc55a42ee34fcf64fb011b67a4e63e5b5b2f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAJF2568639.