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 0xddd57a7312a15c83d19d1e92d92a95806cb2849ff8277e3b0d34840c59bbdb11. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1d2076d-bd02-4ec9-8668-18cb9a2b7ffd.json and https://artists.proofprofile.net/proofs/artist/f1d2076d-bd02-4ec9-8668-18cb9a2b7ffd.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 0x1d3292e0abccb556f1c9d8f004eb98e78695fd59a4bb72b7ccfd559d77d4ceb0. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/FR60Z1300880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83d8160c546b0723e4fbb9888ea567b796afa0ee84c18acd3b6b45ca4bf1269. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR60Z1300890.
Kinderszenen Op. 15: "Von fremden Ländern und Menschen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cb64bb35c0122bdb8cfb00d2e78e69e9037aea58f9a69a59690c5623953f2a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/FR60Z1300900.
La boîte à joujoux, L. 128: II. Le champ de bataille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd2da427c9403df143caae6d1ce9a6b3e17a987ac02c5cd62749ccd27073a46. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/FR60Z1300910.
Trois Gymnopédies: I. Lent et douloureux en Ré Majeur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc5ad723317e661d9fdcb594d373ec9a7b1fc523fe6f68083077857852db82b. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/FR60Z1300920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa18adefaae3ddeda2bd43910e66ecbc352306da93047a1c2166059b467cfa7. 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/FR60Z1300930.
15 Volkskinderlieder, WoO 31: IV. Sandmännchen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105353055aaf8a2884ca4e2fdad35fc2fd7636e923bd7cf65466cf77ce3bdb65. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/FR60Z1300940.
15 Volkskinderlieder, WoO 31: XI. Wiegenlied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c193fb68ce06643905c7d2696d2830006a7ac0babeef0161a30d9382e4b0af5. 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/FR60Z1300950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb838f336065ae88e0047ed4417ce1e48f4430c6f1de519fba2edb8f7589df5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR60Z1300960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a89abe6fd3c3759fa5ebeabfffb5f13cccf5c063beabc4f39d0ed6231e1266. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR60Z1300970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e8e75a0740cda0b6c4e61d6f359fc9ff55a4d601af4fd2a1d9412adf34d3c0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR60Z1300980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e57e3356d389fac8e68912d15341df74c77fc1f1f39f18b279c4dfe1138297. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/FR60Z1300990.
Ma Mère l'Oye: I. Pavane de la Belle au bois dormant (Lent)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35fb5d5931e5a773a9d2fabc77f6a42b3120339ef0cdcbcae9d5d34c7c66d1a8. 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/FR60Z1301000.
Don César de Bazan, Act II Scene 6: Berceuse "Dors, ami"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff6b308d11fd1712a26f2e1d7f50437797b51c3a1fb1bd56ab9016640a125c3. 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/FR60Z1301020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541ec923989dc447888bf5f5b48ce5677241c5f352588b2caa4bda3c46bf730a. 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/FR60Z1301030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a25eb2c84ffd819930f69f8e6f989ad4b338bee25096ecf7e07030590c34282. 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/FR8Z02200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4377769bc829c8d6a31d89ade2f18f41b539937486da10b8c863e542343a931c. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/FR8Z02200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a4f7672b796fa8c3b6404175d76c1bae210ea328b6ad4ba03d8eb739494503. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR8Z02200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1032b4018d3415287f3d3368efa042038801efdfc6c3f9dc8b3a0c272cad257e. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/FR8Z02200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846341c12e5103fa44b002155a2e128ab147e4f138566aca6d8df6895f6164e6. 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/FR8Z02200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd928cfe358745c26eef2a9297f0f8e046f593adf4b37c8938c20969cad09759. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FR8Z02200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2acc614e2864d72b2522400b4071f9871a7c32269cc02d3858f096f543889b7. 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/FR8Z02200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f923c3b2875ce2e3fba31324393664f19a53072d6962fbe7414f87cfcacb865. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR8Z02200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb4b2a9dbd586a20317ed7e0c2c10480f3eb0e7a84170a58d92d6c439967561. 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/FR8Z02200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4f45aa6a0621095c03d5521d14c817ed14105a540bb39ec154a2d096a5a84e. 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/FR8Z02200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a644472230069e7b7a44ea283d37b4903fb97bc49c91fe5d98329452661ef66. 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/FR8Z02200016.