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 0xcbcde085ae0641b50799b8a7e624142dfdb13e1dec2356efecc369f79f26e797. 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/bf921f74-78d5-402a-9e3e-49a55364a5b9.json and https://artists.proofprofile.net/proofs/artist/bf921f74-78d5-402a-9e3e-49a55364a5b9.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 0x122e17e3618b0dfea5ed2b679286b6ed716b1b8128fde923ae4578a348f0618a. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/ESA011814304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a204b2a8d0a15e5ac6e3bc22b3ebabb76a4b2ab6bd2018345834a62ec0ad007. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ESA011814307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ee19354e48477c539500325f619101ee4f74f306d5f0288ce0ab1d0981b7e4. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ESA011814317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53aeb1c9253309c3224149dc6f1b6cdcd1dd1d4c33be277b92d37e96b828772e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ESA011814328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09f28c73b96318704e47684c19ea765af6f4c7bf81169fd4576ea06fae722e7. 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/ES71G1712568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc36af400d91f73ec94ba3336c22042423a3ffa8d0a04b3a4d5cd44ff482a15. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/ES71G1724598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5374aa8eeca87a3a1a2be47c776fa6ab8268633607a5e9863c03a2090233e376. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ES71G1724606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617d4988b0f402e5baf6d9232d196024076bfefa91af7fa855f6e787094b43d6. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ES71G1724599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f1ff31901acbd512c35ed2e861d729909f03161bb888c8144715d451de641e. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/ESA011942649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5feb2823f47833ad0708f59e9247389588d78fb55109dff674b1c9307f483fb6. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/ESA011942650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232865ca1a7665c1ca643faca4612667fafde2ab44ca28982196b263b372002d. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/ESA011928834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f743fddb4c24ff3928ff774ec4b1394fc9b9132a1872ed8559fa4c484358b53. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/ESA011942657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c374a16e706078ff78f243e5f8d7a70acc080f10d6ce02238245b53d87a297a. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/ESA011942658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8170dbe6c544f803eb6a5992cf2ae9369aa058b79d26566972bc50c3081d760. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/ESA011942659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42709d0fc33ead3dc0cee6ad05a9aa30a301f8e17302bf73b10d74bc01051f4. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/ESA011788219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99adea4068827e9ae4edbf986ee71658bc763385945059f6145b5b8e3ddfa094. 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/QZFZ62284416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68dda8641e7708c3e426a463580d55d78d48b0bc73e4d30ac16009f60890d81f. 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/ES6081641112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf01047a43beabcdc11890ee35270e622ec852b8c58d02ea1a122eccbb97a2b1. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USHM21489343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd8ef6e054cf118a4f0c2d916ac3f9c43a515ca2757ae46dabe5cc16b1520e3. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/ARF020600789.