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 0xacf4aa8f3b8be71ceb3e64aa05afcce18e29fb2e719a8dda7e19fad4c7f6dace. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2abef97-61e3-4e76-bb52-83def908808f.json and https://artists.proofprofile.net/proofs/artist/c2abef97-61e3-4e76-bb52-83def908808f.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 0x60b057653e60b905eeb73c5cfd0dff573aee05697a45a15eea534265a9b7dd86. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/US2762101935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0b45ad8da0fd633e0974825b9c3188757ae11d618995c3fcad817dc85b56d5. 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/US2762101936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce979a7f7d9bdd121e855164e3caf13b494dd690d768c775f6305bb3adea15c. 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/US2762100525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0772c1d4891a187b0c0d2d30229b15025df38f0e8f83e5a1a359cb9d9143bec6. 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/US2762100526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67268cee604de6c2274f6d7d58fcbd6a391a7e2978bf44da5fe69fd1174a0c58. 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/US2762100527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b607a5d14a62bb97b676362056c9f0dbb7648711e601c6d40129da1c9597be1. 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/US2762100528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91531a0bc692853b712f3622f1eb7c38d9686392d934c779dac507c1243156df. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/US2762100529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91531a0bc692853b712f3622f1eb7c38d9686392d934c779dac507c1243156df. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/US2762100529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0772c1d4891a187b0c0d2d30229b15025df38f0e8f83e5a1a359cb9d9143bec6. 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/US2762100526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711c7457db98f179ffecef35985ef14e1db8d9647962878f6973dda7253ba25d. 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/QZGS72000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5152a673b7ce4718b0448451cd368d50f9120538db7ed790e4571e64a1afb3dd. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZGS71900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775470619b563a5153ef6c54c8f167cac7a36501e539cb9c4ae6149782b6991f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US2761993289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b743ca93aef9bf1e6ce8694b4ddf18cd2e965b0c29b4bf6d22b36fcf5b7e78a. 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/QZGS71900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b42538a0392323427c2cade6e11b2b407927270a4e2c854018edb64abc3e26. 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/USCGJ1928253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270abcbb8ee2f3b2cbfcfc44c156d28272d5fd29d2ba720cd0ba111a84f19e5e. 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/US2762405290.