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 0x747bb834ec1855479109c7fadb1b011ff37fcb07e09fc9d46a2ae4eeec74fcf2. 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/06ad8822-475d-4350-8487-1dc5e3565e5a.json and https://artists.proofprofile.net/proofs/artist/06ad8822-475d-4350-8487-1dc5e3565e5a.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 0x241392b0cfa90fe7443eb356f39e28a61618ff9c599448badf11ba5c1745fa4c. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZK6G2387925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2c5d93f4ca1cf65db1384616dd0e30469c607c0c608668f48cc024ebd04870. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZK6L2395557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd1c5bd524d3a8b681373546e59da03c95d0f85164d63f82d5161622924f9ca. 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/QZXYG2306957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2caa8e3183f2d97e4a3708a011aeec3086e1092f5718a2a7ccb00829bebae410. 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/QZXYG2306958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe303c54524d0f474379862d84ba60bc7e0bab84cc5b03a7745bf0ba9766a715e. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZXYG2306959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cbab24b16a8a2086df1d193baba6286cf18a5aa78a38a9c4cd535e97b0aa1a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZK6L2395559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1978fa2351563465881a759823cbbe4d4e632069b7271984bb5929bb28a48ad4. 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/QZXYG2307614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0716ce8ca399cd588ee23ff36a4b0311c79f86602462dfaf66b6eb7776c50f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZXYG2307615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ad1eaa059b35c41ef68f94fd3805665003ff649399f35ee56af54b596ece35. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZXYG2307616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1544e1bcca4b349a78a7460e3d2e5a028a2e3e5a7a49ba9a16827e524da8733c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZXYG2307618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b711a530b24345108a227dfdbb1b7bd74741f9329c3aa89ea75bd76dc3889d0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZXYG2400181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4695603197e20ca1f8c468bfb1a04d8289fe0f335eae3ad733ac973160f3bac. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZXYG2401441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27340730c14b1c6ae36838ce32acab6271e034ce3d68154e0123103538ff096. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZXYG2403472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b10a83790b4105340a37137b45325ccf98181d612c292514f52c90e71eb331e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZXYG2504046.