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 0xad797ee6de5d7f3a39b0a3bcfe96f0815659dae8d55e07ea7cfddd033e384924. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91d278b1-4d52-4875-9dc9-2b2dcb303336.json and https://artists.proofprofile.net/proofs/artist/91d278b1-4d52-4875-9dc9-2b2dcb303336.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 0x57bcfa905473dbb5f9da9af6499140268788b54c31201bfaabaa142440891f01. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CAP901700023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fb1d6e3f545e0d67c4c1d3f7cadf5e43727ba7efaad19d14c04f5cd29b2add. 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/CAPYX2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0193c6b0d493ee0f3a49bd4de0c7ba4e2db0bd40763fc6957e0fc15c4ce30fc3. 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/CAPYX2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0193c6b0d493ee0f3a49bd4de0c7ba4e2db0bd40763fc6957e0fc15c4ce30fc3. 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/CAPYX2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fb1d6e3f545e0d67c4c1d3f7cadf5e43727ba7efaad19d14c04f5cd29b2add. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/CAPYX2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d39bb0c350836230a8222f641bc0768995876cd44757238bec3b47686e776c. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/CAPYX2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017f90026250e67ca666e3b8ffecb64471494ef79140e0ccb76089e87fcb18ef. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/CAPYX2200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08411f81d33250b4f8770f36a379062f375a5c93dc8ec270e5389c33194cbed. 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/CAPYX2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387b1c9000e6f60fa58dcdaf25c662d8d3dc46191a3dc600aff85d0e5a01326e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CAPYX2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f57970319247e4ccac76b0bb967973130b717f3bc5fcdfa5baa7f653c97253. 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/CAPYX2400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e729cbae27c392addffbd1b41200d338fd55c85d6195491a0ddbeb6f087aa6b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CAPYX2400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678ab5589ccbcd8150d5408e4c2e59cb25ddc190718eb5947ef48db361f917d2. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/CAPYX2500093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19e4afcf6b5a2b2fda2c56c3244af32f42102584b92a6d7588e1d5cc0ee160e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CAPYX2500095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e813f313fb11635ad0c03a45e703e4964f9648246344e1028dbdcb6a1a9c5cb. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CA6E62200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb44046f0193ac203063e90d0032f3a0e8a20abfafdeb587c7c3339bd328a48. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QMPKX1829119.