thumb|Myrrhbearers on Christ's Grave. thumb|The White Angel White Angel ( / Beli anđeo) is a detail of one of the best known frescoes in Serbian culture in the Mileševa monastery, Mironosice na Hrist
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 0x5d183a558db976ccaac484ab9801785b775080ce12789ba4b9433c466247970b. 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/f73b1e54-5186-45d0-8597-2166aed97911.json and https://artists.proofprofile.net/proofs/artist/f73b1e54-5186-45d0-8597-2166aed97911.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 0x1ae41c036303085ea888dffae3e5f6d8cdcbe8e5f0eae0fdda0faec31bab78cf. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZFZ22148357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4cb3476c1a5d549fc084214333a86aba9d57c5376bbb26716e38ee87b86547d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZFZ22148358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424894fd2208d9e187710b77246af0dd4a942082d3fe680132be1283987be787. 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/QZFZ22148359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46be94b8a66652d3ee305cdcd717dea3a1e4c316c34644a94003970142f491fd. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/QZFZ22148360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0e8f63053a659258a17bce872ecce211a50b9edbb9bdee7ac266f48ecbe9c1. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZFZ22148361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48ae5d8f6058424f04d576fccbe15642974c1a4e98f8def61323b51e4348148. 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/QZFZ22148362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d8f394e1cb92053e46a31e8bab9e3c59fb29afdf8d0a2b497f8a410b3742f9. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZFZ22148363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf835d2f5f9d697c1a8df122cb2f0bb98dd5e08836e93211788330729bd65726e. 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/QZFZ22172899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddd5b42388750a7b971ba2a5c0f9dc2f054d98da5f7daa08c5ab79df9a6d4ab. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZDA42280762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98745c3b21af48f4f05f5facb74921feb70b92166dd5993cc301d3ced400cbcf. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZDA42280764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d53fc338bb4d4abaf1e23335b0085d32d69dc6ece8c5ba25e877902d25200dc. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA42280766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7148203858b44c45543f07ef2be5ae18a63f04e869be2c71618213fbb8a5a484. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZDA42280767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5697b38bf26b1ade243f53ab2c155b772529420e494124e7f9002be6d9ae7676. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZDA42280768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7615bb52a8d36e9795f8c123b8883d593bb1c0515c548979d7ffbeec2850c719. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/QZES82311334.