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 0x818ec341ee0d8481d5af0ff7724f96884ae3a36306ff17c88fc9bd7f86057d89. 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/a59e1d03-8ab0-4ec1-bce2-5e53b20aba3d.json and https://artists.proofprofile.net/proofs/artist/a59e1d03-8ab0-4ec1-bce2-5e53b20aba3d.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 0x116e20821e5446c9d77507ee078a1596916b8bdbf85e8d1ce73f280d9f98d227. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLI362525540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97faaa7d9388fe596177d12baf4eab0c2cf2a2a66286fde5488a5fb089a74cc5. 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/PLI362525550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92c710396ad53a086080a1bb506696ac164d8227708dc5756b93789f4bc2ca7. 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/PLI362525560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d51ac56cd5cc7f09c6856c65cb3e4d0290e1c9543aec6aee82ea149dbd4ac3. 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/PLI362525570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0565f8e31cf919270c13699f7e6ee36a8cbf9852923aad35c15a4f8b2aed79d. 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/PLI362525610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadef0a3126b812347ee13932913112c114914e783dfbb69a0426d019bca70e12. 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/PLI362525640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ce19d0bc3cfe782d6e3223cfd92f4dd9469344fd0744b57035cef1fe0825b1. 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/PLI362525670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154bc3fec1ed4225a1fcc52810c4e4cbb0563334e26398b3136551687ace2e88. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/PLI362525680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496c832eee55fb860e2c920cd7c2f308a4fbaca3426ff61f1d7db5f982cfb9b7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI368163240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178585ac1f15696d4e988b6db84e0d342b2a6d10aac5d2411cbcd59fe19e58f7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLI366436121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b429ae54c0bea283f8185a205e86123067a46dddb20a4784d6391b4e4658088. 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/PLI366295160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc8667c203f754b52a63d8d2ea37ca57403341606ea16617f3b75ffe3bcaab5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI366705930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453c3c0918e543501bfebbcc90e1c96cbe0571825536834a5a4bf0e36d92a7c7. 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/PLI366746300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bd07b7d464ff031c1a1662dda5c3fa3e1d4e8c388f2cde51d0e20728aadefa. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZFZ42416102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaaee789c89b21a490412dd27541aec2101546497b0daf87b165d6f69dbb2bd. 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/QZTBD2349801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89da31c6f68dd08c8faf353a72c8184a0342158c7239f21c6ee111897c67e6d0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLI361239720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f3c81294cd80cc18d502213de2b5c7d4f4a22c256f915591cfb7ff2177c1cc. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/PLI365174290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd758361c33bd8d7bcefb1886d9643df6fb27ad353e7372e3af8d1a4f0aefad00. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/PLI360313160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc7f52a389d484f5b7ec1da5b73cd6751e17542d8b6cf69d6da3084716c0296. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI366073120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca53c42fb7342477f2c7eb222ac52060062bd698268ad3bc1a99d744815d61e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLC062369292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e17d9f0f6294a893117f7feb7dae1e0edc4635cf30ff2a9739b8c531e6441e5. 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/QZWFE2377533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce49aa997c0e92c9293c25665dbdf47d22aca40eb0b4267eea04b6bbe1529d39. 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/PLI368153260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbc0d73f226cc1e9d18fe1d269627c518a8a71ef69b327978ca076234ded6c2. 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/PLI368153270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f427e3da1907fad2bd25c2813507d05fbc54c3e2c3d7c1be0b48be275fab4a. 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/PLI368153290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd6d55f390631ec4f2e3ee018d65e71c4ef8b03a091b62b3b164297a5a75d04. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/PLC062410261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92a4b101128c65ecff1de9a7887f6a30e7c171364ba9b27c9a54de48131ded3. 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/PLC062527117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc116551286327ed79e420903c0bbb21df1a12214899d4a594a1ebfa7f5eebae6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLC062521465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0346a241870b7fed9078f0fc486d8891cbf1525d5c839d382aa82228b54da2bc. 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/PLC062515612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd73cf86fa3f331de3ab56b5cbe0bd99fbd7207d21afd94f151d8f8d4d82e31. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI361148340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4f88ffc35b25381696e4b2edf7322b556845e1296021abf652dd184641b29e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI366761740.