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 0xb74f75808ac3a38988cb3727d717ce245897fd1f444de5e8a674b695429a78a5. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/581ad3be-1698-4da6-b054-5ccd367c997b.json and https://artists.proofprofile.net/proofs/artist/581ad3be-1698-4da6-b054-5ccd367c997b.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 0xa527f390941ccbf2d3bb546f7ffe1f5a5d90e5131a7f687f3923e89c8a79c813. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZWDW2233684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386ff04f7b5429825567234a97469ca9dec5c856674ef56159cf3cfb6430085e. 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/TCAES2082840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf521253ae81bdfa9e6b6fbebc0fa93c560915925ba48d309838da7812248aecc. 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/QZFYY2037590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfd7543d929cff392d233482acc5af44ae1cee8fe3294b3075887330f6e4cfc. 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/USHM82446235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6ba3bc8309820e7336af51b9d7769b75a9f5864bc9d06220eff45964e34483. 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/TCAET2027891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2773a3e520fa4d34e5728c34e9a3d705ee5d471ab954439c07f8645339dbb894. 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/USCGH2162429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91814d8e761d1459740c18598506f36c5752ef82a6b25a02998306e28df09449. 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/QZGLM2190655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5aa5054aab931289da38850773e1bce09b1a4a9bab2e5b70120d33ad8bca57. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/QZZ662325230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71dac6a3985bc2809935bde3cad53e0a6a39cdb2666008814f0eb0c379f1291. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZN882357089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1193bb6744939545190f882a920367e2dc2761e7f3f166d45d90f1c88525bf. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZN882275691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af4c685e8e533aded7e14aa4fece3927a7af47bd85666ff66c4f0cdfd8314e4. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/USHM82271469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feb1e2af6bbbba0c74eb71f13aced19894f55e4fde664dbe2544188a7fb39ea. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USL4Q2116560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c2135b0a7e6b548b0538f0d8c193c0d92ff8360c25851a6aaa52c036762754. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM92163717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1bd0395eedd6241bcadfcc2663ec9a9b0642b5f0e5c56dd5a963443aef297c. 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/USL4R1941278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9c9e1eefeebf78a36c941122ee0500376e37369d40dd7c91e8ca3956093ba6. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USHM91969051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9312d21843afdb80db5c69ff98fe601110ad469eb2ada5d918a18e391726fc21. 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/USHM81934665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0f38dd884214f35691795ee133d997d1f6ded94de8238b0e0f1a2ab5cfa482. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM81934666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eca9399794a5478f42ba807e750ab702f2c70eaf1417ffafec34c2f9e356dba. 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/USHM81934667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2cae3ddb819becbe2f0e5b2db864bd872e886d1d163ec90f5f1774f6ded9bb3. 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/USHM81934669.