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 0x82de53753ffc2b6808deb7ed394db960083ff22d74712bd85368385f5594f40c. 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/1ef4ae5b-aa02-431e-a424-e0e48ab5879d.json and https://artists.proofprofile.net/proofs/artist/1ef4ae5b-aa02-431e-a424-e0e48ab5879d.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 0xc84e96f06b1716dbe90ffe41be0433301a0ef736b5c11f61fbbf08b1fd6663a2. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZHN31903444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf873f7e9551d2bdcedc08d4c649751e912ba27da7fcc81954ee32df62af5978. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZFZ22075793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf873f7e9551d2bdcedc08d4c649751e912ba27da7fcc81954ee32df62af5978. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZFZ22075793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46b52cbfa3c5c515dd5fe70ac29c38632ca7d806cc7f3ae137bca9ae845f93e. 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/QZFZ62088354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46b52cbfa3c5c515dd5fe70ac29c38632ca7d806cc7f3ae137bca9ae845f93e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ62088354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be3b6b8a277a1421cf654befefaeb79339128029d6ad5bf4b62d905f1f63be4. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USA2P2011350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9400542a88b8ac45b6f94ecb08a2e60e44f0e0ab6c2ddf60f357e6245e3e4864. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/TCAEU2010879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9400542a88b8ac45b6f94ecb08a2e60e44f0e0ab6c2ddf60f357e6245e3e4864. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAEU2010879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0faebf39420dae32f30168047f00c545ed95b23cc7f1c1b2fad1cfb7d805f5aa. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZES72074125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3601ad909c50fd74f9175123d54e10d226f65e69e9a09b2be0b41e55a70fe02e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBSMU8696704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff558b533708b210cae0b09bc14e1eb13d24c3eb770f1e0bb8e45c6bf3325a7. 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/GBSMU8948444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f47f9b765b782e0ef71a0a0d6a81f1d27d912ad8c5a8507ffde6c9468d25c7. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/USA2P2105637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004d6458565b2aca70370e93ea52b5c65a5cd6a4549e3b50f668b54274d5de9c. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/GBSMU9683115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ac853fe6644753ad715488789d0f564f6199e9b752e84856a06b52fb0232e0. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/ITDI32100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004a0cdcde935c1b9f62bde8c8cb16eb0cfc04745fe1b6007eec52cecb2e9311. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITDI32200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd9dbabc4f7bb7d3b8e06a0655e51da3e9dbcc502030e0244266cfe15664ed6. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/ITDI32200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe767d9b5c2bd4ae58483a623a269b2a95d0943db2529d3a383d6328cf8c841c9. 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/ITDI32200196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9480fe015b5f0992c04d5d90286f7ec956dc188fae1793938f9d29a96de6e689. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZZ8B2569245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e875aba392c717d782c04574e518b171ad83de62727a5f413d52f9f61976e0. 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/QZDA72128038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ce776eb0a8bbf5e1acbd3e3dab3ae50825bad7e2d3808077342af2122fb41a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITDI32200032.