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 0x94e836e0fc0a6df43e280d7ba915bd8ce93bd6f218df18006b78bb3b10b4b05b. 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/b5751b90-55bc-4924-8b2b-e60de6b96be7.json and https://artists.proofprofile.net/proofs/artist/b5751b90-55bc-4924-8b2b-e60de6b96be7.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 0x7a612a807d42719bb16eec4183f197c011fa133c132210b4f90a5114e01a86bb. 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/TCAGC2279186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcc5a2738b34d9dad11887a6a1a758bb92c27e319fcebf9739020153ceccafa. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCAGC2279224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d144b20d81144142a1fc2b56b32e2d4eef0fe1c4fcff74b1236a302643d2e42. 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/TCAGC2279228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8208b9eaf2886d9b4477e3701c0c6d170effa10813436ac652d1ddb0f843cd7f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TCAGC2279229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa6faca07b4d714375eaaf0e47c54c3e14ef39ae0e7d127fc70b904aabd5014. 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/TCAGC2279233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1766b1f21b22ed0e45b7bc5b95a7de3df064d1e712c2d5952734d5f3c6947d6. 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/TCAGC2279241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf5eae4aa3543ef47dd2d65eec411c34c0e36ff927e2e3e57fc20de4a10258f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCAGC2279254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9ecc10135408dfc9db0bd33144360e413d95e017620f0415e2ed8a9dfe81ee. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TCACG1578394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a04b76f3e6a57a39931ee4af23800da522cdd7f88c5d32dec5038d3d6e437c. 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/TCACG1578396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189d1a63858bf2dbdf611aa425b22c4fe03b84c14a4e6cb6726fac5ffe5201a8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCACG1578398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb461c775c830023bc5f75ea818f8931fc3d084a3a6ff20b6fdef6ac022e9113a. 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/TCACG1578399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5beac57b3e170f04f0710193202ec1af0ef003364e0504d6ee6a940fa12c736. 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/TCACG1578470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da28f965424c531b480b6d071c3dce9ecb65fa75f7a39b94c8832955468a72a. 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/TCACG1578471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cf765d03a783df1798adacd04e0a957046a9e694c39b8a589d981bee3603c6. 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/TCACG1578475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb7c84a64f4a30e658e97be675047653e1183aae1f7cde8b7cd3255da85c32e. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/TCACG1578480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcbb5ade35d1dc783e8d1af2b16ac5adcfe938eacb489c6c48dba70b285a2f0. 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/TCACG1578481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6d8fb6d5f9b35c1b747fd1ea94875b9bbd11f6a749eacf9b2bde3cb7598ecf. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TCACG1578483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b4cf305e06ed91076924ba0051d769bc2e02bc520d2a82dc148dd509669dda. 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/TCACG1578485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfbf1e9959983d351b395a23daa69ed51f34967ec7aefb3bb0c1b2739b567d6. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TCACG1578492.