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 0x17e2f01253d19408e3d637993cac58ac2664ae6b403ec7b0f8117915211c20cc. 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/c038babb-77c6-41d3-8da1-ee65865e2ba9.json and https://artists.proofprofile.net/proofs/artist/c038babb-77c6-41d3-8da1-ee65865e2ba9.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 0x375cdee55db7f6d466b55061a67258cc07fd6002794a63ff0258e24e19b85a32. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAEQ2037359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb042f3b6dc5cdb5244f722524c71f92e291a0160d6a250ada62565d479bc203d. 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/TCAEW2059090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0f7a54fe7599fffaa90f06e9b2a56717b71848d8a57ec4782298155d77db02. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAEO1914848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1c307dbfb61db9a0bbae522ec2b64e8b23aa2308a3c50c86459b0d11dc2c1c. 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/TCAFU2177530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc711699570d9d164b0ee9cceb51d5fa57ce7518ab4765e50a82c27eb1f5884c3. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCAIX2425852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9913af0bcb5dc4ac4f52e3be90302d0fd2d265a71693f09cbf330557d9b39cc2. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/TCAIN2475651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64dac94df1c66976b41353e0aa6005282f900df73e275340e93627f3b4a0557. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAJG2551754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09586ded48b744b37fafbfa47fa50bba34f52c238a6a81fcb84fa242d81c2636. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TCAJI2508737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6c68874071965532f7a866b250aa9a0207a4605225464fe5645efc2256ba1f. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/TCAJI2566076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79c58542127c21892ff0649de0d572ab15f13339f1dd315b50db26ad9461f7c. 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/TCAJR2530015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ba12862e8af007f56660b0161138e4560c169e75be16da57fe4a37bdea7e48. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAJX2503201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2fded2f05b0a5db6e30c1bfcc690a8dd785bd432ab8b965f12b5f5665ffa60. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAKA2533140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63a3562d5de388f5f2b794dc9d9b97a3ff3548b326d8b978b981ace8dbaf5e7. 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/TCAJR2549071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79c58542127c21892ff0649de0d572ab15f13339f1dd315b50db26ad9461f7c. 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/TCAJR2530015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1cbc4056e131e3ca0fe4c328f04929415dc9689c8c0f40b0e71c7ffdcbd39c. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/TCAJX2503154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029f3b120e850cdaa08d867c7ccc2acd5b41d571dc248e30287590b61e5844a7. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/TCAJX2503171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1677c43f5d08c46c7c0ab9bdf4804f2d5903ed2aa88386b256013f0654ce71. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAJX2557581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83227386b240148ba9de83be0dd4253f572094de3640899c0731b020da2f590f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCAGW2335641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ded6ed96ea5fdcae62bb5ca8ff36371a5040c574f20fa9fa8f0f1741abd23d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZTB32291995.