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 0x77d8501a1e759b026e890cbcb6fc6959bc3f820215653ccfcf4da8c11d83fea8. 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/bddde456-d377-4e73-ba54-79225c039209.json and https://artists.proofprofile.net/proofs/artist/bddde456-d377-4e73-ba54-79225c039209.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 0x4afe10929b27aa795762bbf42c4107c9798bb4ecf50002befbb7039831482c95. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/FR0Z50068687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c90447a5419fd982dbeb23923dfb6554d58156f7c1c20b5ffb9a6ddc359629. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/FR0Z50074235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1940a72179b7db13f5756916ef9d4f62ff8fd2d29d06baa927936f042e38518b. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QMDA62247371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84ae294b03f65a08599c1276d0931cd9ce82c5097b7bafe98a2044aa3fbc077. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QMDA62247773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebafffdfb9eaf56dd092d772b35fa6f7a30bb88cafa3c1c73fe92df33940cfe1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM4TW2377788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a78d51504789225521c711417dbb51a0805f80ee8893b374de10d2308189ef. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DGA0P2387583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b29222b49bc2b9ff7e7f88d6e29e5120c6a99310d5bcc2fc5b18e50a193d33b. 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/DGA0Q2370504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb93a16ddaf6e71ed3f2357929d6b00095c5755994c350bb8d7e563eac02e285. 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/DGA0Q2370513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ec8a0f7d8da6e648e736416eb5cc6b6d0ae448bdc2ca47b887862456d3ed7c. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DGA0Q2370514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa102d33fc07996d8adcc482940ccdc59e9fa5d53058b21d0bff8447ef85b55c5. 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/DGA0Q2370515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fc88f5929b625e4d258d88ae25a741aac18f53cb801ecf341767868c142ee7. 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/FR10S2522608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525fa4afc4d5416576e0dddf41d9a2be39689a88d4701ac0436b87d5c18e86b5. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/FR10S2522612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a26009ba63ddd782dd51aeb889f8579d2d6153722f651b76c29ccf9ea4bf23. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR10S2522613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695d84d7f9dcd323fc5bd373716af3615b872ee29d706be22285309cdf6c806f. 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/FR2X42552087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd9a2bfcb8acbc52905edc1f981a963d3f3b4ada0f27f9855b99658e7b5983e. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/FRX872568049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6db746f254466d20d688d2aa97f2c175316ddede307473a80340daf7dc09d7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DGA062527413.