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 0x0e89ab651787755b5b4ac4b0073578dacc3e66e863ef4fee3f00f1c90cec03de. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/93148cdf-c2af-421b-af8e-c5b890294d64.json and https://artists.proofprofile.net/proofs/artist/93148cdf-c2af-421b-af8e-c5b890294d64.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 0x18b616c6175b6000bf2e385f074863213e0e32281f794e6e68009514f53d18e1. 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/GBCML1924501.
Kurtág: Complete Works for Ensemble and Choir
4 Capriccios, Op. 9: Paris I: Musée de Cluny. La Dame à la Licorne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c835fff26eeb1c11912afd96706c026d473dc61dc847b86c0344ee9a8a1c49. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/DEB331550501.
...quasi una fantasia..., Op. 27/1: I. Introduzione
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13aaaf03d61924e6f728c17894952b0d0ea9e274e8e46cbf99a2377763b72639. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEB331550601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53aae761a8a74503a4fe8895066e8434fe00c8595b9c58b2635b6dcff20ff585. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NL3UC2301353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027c07f98e23aecac2c936d75fb2d659fd54dc7fb5811a917273f5574bbe001b. 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/NL3UC2301590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53aae761a8a74503a4fe8895066e8434fe00c8595b9c58b2635b6dcff20ff585. 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/NL3UC2301353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddb396b05ca0d2ef9abdbbb56df8133733c9bdd414de6f99156869330d25330. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NL4AE2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c222bbec2b95369cac9ab3404eafe0c8aa425d9eaf30d4b4336e470ced4664. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/NL4AE2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d2581537f669b2477120789e92a97a73fd34abcc59aecd2fac29e56da64af4. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NL4AE2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb0104fd99a66bbc96ce954ab2b2623b49baadcda959f733cccb651756d148a. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/NL4AE2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f57200fd78788faef163fccf56880e46c8406d6e7ce68cfa35f8ea57bdd92dc. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NL4AE2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcd547e79fca739be5737f4db788415afb3b8b38e4ed35f812078f2ce958da2. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NL4AE2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb278bb3c0b9c8a2f86666582b15d252089cbfa4747a8277fb1dd27b00c2b1b3. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NL4AE2000007.
Kun li-guitari wataran ayyuha al-maa' - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c52e072ebdd8fc436a873ed2440e59df88a92750f36fa343bc8154ed2b1f9e3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NL4AE2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05fd3ff0b9ec6d206fe5fb1100d6195d1d5690a9773d8a1b57caecb251c36604. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NL4AE2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ec27f8c3017bccf3d9eaec385fdab430fa16a68003cbe60685b8a4ebf849b8. 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/NL4AE2000011.
Michel van der Aa: Spaces of Blank - Mask - Imprint
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39831ce5de3ea0826b82126f8d4a6df4ce91c194b92f59e38620400195519be. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NL3UC2302513.
Param Vir: Wheeling Past the Stars & Other Works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab8d54730195497faf208c35f550372bc5778f7ccf451f86410f05bb9228bfb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLC8O2500118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcceb97d6a088475dba370e4d3e1b3ace67b1374d5afb99636cc54fa00d35162d. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/NLC8O2500119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0ed897eb7df92ddfeb1714ac278327c6d5a18172d67e3863f5cbe16408eb43. 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/NLC8O2500120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e188af77a80a9b69411f503c9b5cd129eaad7aa251d4c36b2fb9e7cbf407d4. 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/NLC8O2500121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78314f27731ac811c2d1e1395c4d46b910f8e89e8911ee1e2c02cb1e2333c7f. 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/NLC8O2500123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754db8a9ccbb3b773c02e1a5578fc6e50dc7d4d7aaf8481f527ce7cb5bd3fdc4. 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/NLC8O2500125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd578b7fc6f4ab907587c4e57b7c397bf88bd989221d8b400100b2f67e7c534af. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLC8O2500126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b783def7f84b4c6c2d36864ba37ba01c6b452ad9e9255dcaf896deeb7f04d84. 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/NLC8O2500127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4d558fa9b81087441746381f8da2061e3d096238818160d4c996bd26ac390d. 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/GBCFB2401319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2decb0f70afce73aa0a0c152dc902e73460cb444f009f9f391dc54bb6a0ae8ed. 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/GBCFB2401320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e4e06b0239a790e5e01ad1481419f2151ceadc5a69ee1180c88b7eb9f202c5. 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/GBCFB2401321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe1c376c51bf78d1041c28b38ac9d95d49c894762ea0a711970d23d19c6fa74. 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/GBCFB2401322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4da2ff07e883b6865e505e421e221ba008975cb91bbe9c0f3009ac47c43274a. 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/GBCFB2401323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649fcf901ab04586ffae35eaf3123213762eeafe455c2687de4ef0d18dab3d40. 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/GBCFB2401324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90308af126b7e1c66c902133ce02f99ca180a3ad980059d2e29775488e4abece. 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/GBCFB2401325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9e5fa87d539b404cd117fde3f797492965fe61cfb355d3b60b6b5a1f3d30e2. 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/GBCFB2401326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4d558fa9b81087441746381f8da2061e3d096238818160d4c996bd26ac390d. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBCFB2401319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f002a55812eea5542af9b3e9e84190ba1620feb3270a9d271573a2d17660030. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBCFB2500138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fa1c52cceab0f892414a893bad09cfb243731ceaa373a324ba6348c7b355b5. 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/GBCFB2000729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e052ef225bf1fe7763969ec77cde3edec4195e850d72f44fce2e0ad2ac48c88. 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/NL5UZ2507119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c22a2a9c6c588430fa1faec7781b33326d50c4418edeb791b2a273278b809c9. 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/NL5UZ2507120.