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 0x58193899271255b922f9fdf9d15a06f148a76a982353e5ce1d4eb2e87ebe8808. 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/6c326a5d-b2e8-4cfa-8a67-cfa2061cd767.json and https://artists.proofprofile.net/proofs/artist/6c326a5d-b2e8-4cfa-8a67-cfa2061cd767.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 0xc468823deeaab7276b364f7bfa712dcaca36aac66d93acd4ceab7d63421133cc. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USA2P2361761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6602e3d79cb4fd3f02075167d0c23fd13e808228407b8066b3e83e3a399832. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZTAW2363677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d9001828f79991a2ce1daff3206a70c24bf5b63d3dd133cd410bdf7266faf1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NOCKK2335010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d67d6179cfec2e13c661a39f82372a0be25315768477e5811c365e6ab403ea. 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/QZNWS2344541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd1fb95b2376084a5e53748c3c55fa77246c14dd08beebb507312aa7047d1ff. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZK6N2302904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0ed0aa48eb53eba549a21aec002af6705395af4be5fd74ca93ef04db2a6360. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZHN92304678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2055c514f45f80e0cf06dc8f0353fa04d2169177167e58070a40f5f04926eed. 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/QZHN82387017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa067f9fdc52df98c38727767ea09bb43f9417584d93b5713803e23fd9794cc. 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/QZES72319177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c652374655aa6283871e557ba1b7166df5e34e839b56bb011eba92a6fc4d268. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZES52387155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e5446540163a642eb29865d5553cebd3dcd355ee240b2ff165844c1866d0ae. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZES52327800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720779cddee65ad3fcfe03465a130c552fa9b1c6f2ac13e652dceac12a45c033. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZDA82335386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efe33780213e1eb3c742eae62eb49239c6a77e626fadb3de0c61056f8c0ccd4. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZFZ42396126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71cf2cdfea255b5b0b301ce2d0622a9537980f58ce7aa7c7c0e17703ff7c0f4. 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/QZRP42245507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db8383c97c38224e6c69450f41b4aee42ea10e077208f3e59a10b7e6ce321e8. 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/QZRP42239077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1afb3bffbe211a5e7d2b0f7c2a77df05eb4fdc9d1b03876566bf8ddbcca98d. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZNWU2225795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f6a807d06b000b89a006cd25009f1891094accc9df9f4e4847b5ff92cc1c7e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NOX8G2400010.