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 0x379dea319d2b438bd815578721def51685cc655863cb49e64a00a8a9f284f54e. 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/20d334eb-ebc6-47dd-92cc-a9aa1c4513a3.json and https://artists.proofprofile.net/proofs/artist/20d334eb-ebc6-47dd-92cc-a9aa1c4513a3.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 0xfc8f7332bcd391d292d5e7b5a747fb3fd066bda14e58159c86a1bef636b24a59. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/FRX201816850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8f7332bcd391d292d5e7b5a747fb3fd066bda14e58159c86a1bef636b24a59. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/FRX201816850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89995fc6cdcd92eaf5c7bc2105dadcb5d4d1fc5392839612dbd54c116d06f56. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR59R2015524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b724bdf6481d7001620483cba67a6c9b222c09fac3ef7d0a9276455a364ac2a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PHS112200293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98cd851ba1fc99185c6f88f0fb075978f9ab023c79c427bb6445d0effc670162. 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/PHS112300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99a636842812ee92022d8795aff92373fa1ffe7715b1a9b2724bad4e675f466. 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/PHS112300210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3b4849c4b785fc622f727ed689b710f224c8731841fad0265b581b739ad3d3. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/PHS112300439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060dcc9c9f01b275b3e43142c4c074ab3ba5160e49a152375be6fd86ae974059. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/PHS112400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35392bc0347da8e5c72a8f87685b975aa73b305b8264e71198fe85821e4cf393. 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/PHS112400153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241577c8ad1f1cd1dec6348afb6a3151d974c1fe50e0be5f62120433f896460b. 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/PHS112400548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241577c8ad1f1cd1dec6348afb6a3151d974c1fe50e0be5f62120433f896460b. 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/PHS112400548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15df8cca29f70355872627a37c196cd43da4334bf1059c73275557033bf3095. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/PHS112400780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b724bdf6481d7001620483cba67a6c9b222c09fac3ef7d0a9276455a364ac2a. 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/PHS112200293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3fbb226f0d68efe37b16c55bb5b57307d86a41ba2c297dedde3a1d84925f0b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMDA62174983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b87c78a39abd35ceaf76d44b683207e36c9626040869c716a32c04b924028e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMDA62174985.