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 0x726ae623d01ea31715cdf52074a92b02a6b3ebf98c392f76d45ae4de5cadef90. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8edfdfd7-c136-4541-b7b6-b73f0ea41dff.json and https://artists.proofprofile.net/proofs/artist/8edfdfd7-c136-4541-b7b6-b73f0ea41dff.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 0xf7483ce979e686b868794f088e847d78479a074f6fe28766f242f250317d4d32. 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/QZTAU2430679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa440e41b672ec7b0e95d64249dd9ff0ed9a125c02610994b2a1e9961ae8129b1. 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/QZES52466498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70194a6053ca15687aeeb812c8f993b125e5396be7e247261b6fc0827f9a87a7. 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/QZES52466499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bafda5f5bb96d9b330153f0ead3b17fde65833c97f9e10724182e90d92cc2e. 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/QZES52466500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fda273a36225e55a91abd3620c76488b0dcb5db32191ab4b7d47440b9a50cb. 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/QZES52466504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fb51dfa9c2398f455556923ceae38a7774f98bf3d453744429212867176f6c. 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/USANG2438155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd052434dd484887454bf61f6826092a52f49a64b5b17f826db07599e13313f7a. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZES72449642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb222afb7a05752161e91c4e517f5700a26a7abab4688c9da25f0e131849cc0d8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZFYZ2400826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107311d1329fc963f9f34ceb63f2fd1f4f303a3943d69dbc28b956df5343d320. 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/QZFZ22453029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6038efa6a03d7f89c6100d05d739c3729890043b791a4a69fbb68573ac1afc7c. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QMANG2247393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0653b65782f98937bbae7f9a580a1c1c39a3667df1c0a80074dfa77468560869. 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/QZK6J2327700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0a658ba7172cb4b2fc311cf395131218c69055d4c6ea72ad96cc25cb2cb983. 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/QZES92373991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ac1b49a33060eb3c391c2140a33525c7945a6cf94899d122536876e0bfeb33. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZTB92262245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87cdfdb25e6a4c8239b2d9914e97843eebbfec576383331416b8521b1b4ae7c. 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/QZTAX2296620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39520ee52fd799ef2605f091277c44bf1b3dc76dfc3a72f4844941043044d20. 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/QZNWS2224702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea78f37936a69e4305dd9c8818f5e8fe627c63e82523485e9115bcecdb11e28b. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZK6F2235626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834fe72e6eb684982c15980bb0fcc434ea0907e536fb77e87c061b33a233b7fc. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZDA52456112.