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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdb3f4587b1fa9b74866d5979943f8af2770c8800b60c861b48885cc8792d9d. Chain 2 (Bitcoin): anchored in block 953820 (2026-06-15T18:35:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ffb0977e-49e0-4333-a6cd-f440fc176a40.json and https://artists.proofprofile.net/proofs/artist/ffb0977e-49e0-4333-a6cd-f440fc176a40.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa251e1a5e8d71b3f04155be37a40197267fef876ca260ebbd5872442c8344e0a. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:42:31Z), 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/QZ5UZ1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fd1433ed00dc93996fb804beabe3049ed27f4776efe5cbe6428fc08071971e. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZ5UZ1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b2fe66dcf2e8fe1ec629f8e95f6daf07bdcfa2a1284be38295bba28c3e67f1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:18:52Z), 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/QZ5UZ1600003.
Alle Meine Entschen / All My Little Ducklings (Vocal)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16089d6a7453e3832b1ea8656913cf42176855c6845026e2449f2b8a1f588262. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:41:09Z), 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/QZ5UZ1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586df9f3817de6dafc306f80edd58c4a25ba38046b59e50cb9620eb18dedbd8c. 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/QZ5UZ1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94270dff8f46486ef9bb2b1fe2402607bb6b9745f64ca5b5ae08319279476135. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZ5UZ1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d9325a6cd3a6fcac25cf460efec180624be977b8746c81bd1175638b7f6a85. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZ5UZ1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f3c15cbc05e24c896bccce2a508caf512509f4058b57578fe7c2f4330cc27b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZ5UZ1600008.
Ah, Vous Dirai-Je, Maman / Twinkle, Twinkle, Little Star (Vocal)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d9cd2a24f939cfc6048ec9c6b1b83733937e98991b4fa76fa003389cbe44a2. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:59:06Z), 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/QZ5UZ1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a86a784e2f79d55d20386fa0aba8e6aa51b3fa18fc9481057d8c9c10b4f06b. 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/QZ5UZ1600010.
Frere Jacques / Are You Sleeping (Vocal)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228c60fb6bc99f9eb52c6c69e0eccc53c8a16f246429b9e25591888de7a2c221. 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/QZ5UZ1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8951d908fdddf7759c654d58b8689a578ed5187abdb06038f90d88cbcd2906. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZ5UZ1600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3c85a90818a02e49fd46ad7837d0b7d8e52c68b71b962379295f6a357d5c2c. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZ5UZ1600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917369b671587d6f9bb6de62bc411207dbbda773ab9af4d7f9470a09e93a0c90. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZ5UZ1600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe103c8e5f32e489d9d9ef149f7e0d275f06d5ab5e19d7918c44e7efad5445d3b. 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/QZ5UZ1600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c2f6d618d8e9becdcc71037dea65b0628998eb8208c8b5d31a8cc88cfdf3cb. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZ5UZ1600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bb7b270c1aaeb4ccdcc3fb96fd26fec5a2156d549a9226b454fc28084251e1. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:21:20Z), 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/QZ5UZ1600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553e715fc4a2fd4523c8d863461d464085f3f42c1335eff7b4aceaa90f4f7a60. 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/QZ5UZ1600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e1c38d473e5592852f96c8eb190b4dc5a9820a7322063d8dd4b68bdd33eb63. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:26:33Z), 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/QZ5UZ1600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e2676f8f38d0fd8039700f308a2df3ddd2654c4b10ba13ee937d6be0718157. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:53:17Z), 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/QZ5UZ1600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cfcdfe3274f2c319919726b3d71981cf76e670a51d29c19ec597cf7ee9e491. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-21T09:07:37Z), 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/QZ5UZ1600021.
Die Vogelhochzeit / The Birds' Wedding (Vocal)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b86fd5acf3127afac5d6f8f2ac3274a0c8d4c9450c5de6d3127ecf1d3eb29ae. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZ5UZ1600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fecb7654da97f86e470794e64c21693484d082ff5b658568c7b4beb5a15cf5. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T22:51:25Z), 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/QZ5UZ1600023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97004b51440a192b825d0f447415885dc4b8cf75735e3482bca28573ee5f9cd. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZ5UZ1600026.
Alle Meine Entschen / All My Little Ducklings (Violin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2521d615c0de3268f20972c2ddf90df26e62dd3e1e74a1e4084cc2c52d51af. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:01:21Z), 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/QZ5UZ1600027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f1d172f3357123c17c565defd057ca5f6d285462c271804c46847298691c21. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T17:06:22Z), 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/QZ5UZ1600029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7986745f589d1052901d0aee0e7ecfc93f111a877846d60603543d1a375b26. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ5UZ1600030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa67a1c346afe5760dadca33888059fb26eb558b24759c8e09ff77ca55b7e19. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T01:58:46Z), 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/QZ5UZ1600031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ee86f73f6191c8ff4bd8ab8e4577588f753fdf88ea8670de215ad8487c4e72. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZ5UZ1600033.
Frere Jacques / Are You Sleeping (Violin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9411bb7d8e0961dea193856b0da5c4fac4478d7d730414259dd57fc9552add4a. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:37:20Z), 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/QZ5UZ1600034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7526aaa61613144fec40133173c56e8ad5bf6eb735f584de4022930fde38d225. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ5UZ1600037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0132542e4c825212bed290d4adb498b685fc8f7141c93162e034e44ea7d8522. 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/QZ5UZ1600038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d79fad730a7300f1e26a556668d6ecd031f48fb3daef7069c750546fa8556b. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZ5UZ1600039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8e14657d16e40980c68ca59c0b30e1ed00e09f58f62d54c57b3bc86df14f19. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:39:42Z), 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/QZ5UZ1600041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b859c0cc95ff426d75301227731fb49494be77a48906f2a80d6ac7a7d00d51d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ5UZ1600044.
Book 2: Kaleidoscopes for Violin, Vol. I (Violin & Piano)