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 0x57d3ca0ed2a9e632d4adf04713975953cd512a0de63bea575c20ce41246f0403. 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/dd13f15a-2170-43a8-8f75-ae68dbcbba26.json and https://artists.proofprofile.net/proofs/artist/dd13f15a-2170-43a8-8f75-ae68dbcbba26.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Spanische Gitarre: Die besten Lieder auf der Gitarre, Vol. 3
Spanische Gitarre: Die besten Lieder auf der Gitarre, Vol. 2
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 0x91b38eac238b74fd7fd90556b993b8664ed878085f8cf41cc39aab6d594c772f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEMF31400207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc53d6aeba90551010f3213545badd9fc51158912f3947e20d79598f37b3845. 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/DEMF31400208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7a58eef0765be647b0db5d77d2df528a42a6e977195e980d1e2e71c4b522ff. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/DEMF31400219.
Spanische Gitarre: Die besten Lieder auf der Gitarre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3562aabe2de4ff18d1a19d03d2e82fbd84d1e3e77a3054a0d142fc55d76d907a. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/DEMF31600735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84149ee323f666d6fa0433bbe9025b09850dbc1bd760d89b6bc43f4b78eb9dac. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/DEMF31600736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c626189a5f3c4f9b777320019bfa4803a3770ec8854ce1f4204c9114178aac9. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DEMF31600738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae9fde480fc710a7ed8cf05bce0662cff6cf86988554dd4a6ca5ed0203b7e02. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/DEMF31600739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd753b69de06f9d4eafec616920e628ad24a42fd75fd4173847db4d8746ffb6d3. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/DEMF31600740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303eaca0f0c7c49628ee183f4dda4cdd87aea8639ccd67d3542a72d1e0834aa3. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/DEMF31600741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3c2efc86e5035813b3df3d50fdb3ea4c95518bed530b214d469b3e050a7cb9. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/DEMF31600742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4cbba29113a7c7002b980edee56474a74c8415cd6fd996aba964f8351c68a5. 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/DEMF31600743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b2244d470556db7833c28fe8f129389a33fd3482e8d0768073f8db1470c18b. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/DEMF31600744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3bc14c5e9069022077a6aa181be708d228591a096ae6553c1c8ba81d084bcb. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DEMF31600745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8321a43e7def2beace00f30c4ccd7800ce8bb8cc9899cb1f4594c173b0011db5. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DEMF31600746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c7a0949c32d4bb582e1df26297e2bbf7809da2e8fd2e5907bdd58b7bc024bd. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DEMF31600747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd177fded80ca0ee5d9b77f47473e6363461c65cfa14a43e57d6808e13b02964e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DEMF31600748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5047bb554932b8ecbf37647caef33d1acc33659fd08a4ddf6b14ae89ec235172. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEMF31600749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a5c633f1ca4654db9ddfb611576cefb7a13a3dde8010328ac559e4d38ca984. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DEMF31600750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69c8533e74db1f16a6de9358b8d8034c193a0ea0d54c3ace83cf298c0e59d4c. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/DEMF31600751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b2b89994f8a7d2e3bb0725c07fb7788415ea94da7db03eb5002fec49f76776. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/DEMF31600752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fca86c441f9162ca23e9fa840be0faf7d29cd5069a08ce5f464ae7828b30408. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/DEMF31600753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4339b3ab164d80b21fdd8cebc7590cbcbe1bce883822625ca0d0c08ba75b33e5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEMF31600754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a3a112a59f5132a463bccdf60bbea5fd2a63c7ee74b7a6f6bd2aa113dc45e7. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/DEMF31600755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed41b12a08390e516dbac57066c440133bbbfcfea38cd77ac9e3b8b455e0e40. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/DEMF31600756.
Spanische Gitarre: Die besten Lieder auf der Gitarre, Vol. 4