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 0xdc8f043fb40aaab2a21dbdb0e4cc2cf94772285794a3b17d0a6e5f21f817fd1c. 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/4a476bc1-7440-4734-b081-960881a001b8.json and https://artists.proofprofile.net/proofs/artist/4a476bc1-7440-4734-b081-960881a001b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Day By Day: Classic Hymns For String Quartet
Day by Day (Classic Hymns for String Quartet)
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 0x1df9c6390bcc68df96a29020f9bf01f0ae54b0d12796f1cee5ab1b7f2d2cdb07. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USQY51109993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ca6d097e9a50115ab643257235cfacc7f8401551b80930f7ef639675194479. 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/USQY51110000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bbb5cc5d242c268916a3c95eeb5460ea5be564be26de4aebd6f0ddc24bde8d. 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/USQY51110001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3b796adf74864904047935267d5d6b6829f546c08985314e6c57f0d1853cd0. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USQY51110002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147dd5aa64c41e8de97e72ac926fcd396429cdfae6fdce705325629c05a6e50a. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USQY51110010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cf22cbb5500cb1b080d9f303944fe369e9b12eb6c4256ea925047a2fb5cddf. 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/USQY51110013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c36d5f8ffc7524d1265a78bbd5622f816983e7f9cf52adb62401632a8815297. 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/SE6A92373643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13a9288ac697d3884f313909e55d5395d54cea7db24e8c3653fb4cc86026eb5. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/SE62M2326419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa905bb12d511fc8b3b85d710f150e5a0d9c65a27d931075278add88825dc20a. 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/SE66N2372123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f78f021020b8d1ce5b57f79204c315b0a1e8f3afda1d9f408aa3af243494e06. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/SE6XY2397849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d25e219ad0a64c9ecad23086b46e26d41a071802fdaa963b1dc60eadef41cd. 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/SE6A92342135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679d42884a6ff297a6cc632f8cd9f415acba73bf8ea77aa4e158a06264edee1c. 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/SE6XX2303321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf467d2c5df8c56b6b593b997c302b88a5a7ec7c096617153a21efc308d22180d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/SE6XY2362563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe514d071b4a5736590814ce735ccc162428f30d1f99d2499e1d3bfaccc0f7ed3. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/SE6A92380126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdabe6ab9fa2218c5e281cd7a61429c0fcdd439568cea4783d4fc5cb5a3a81bc. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/SE6XY2532927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57aa9f4aec752009d644d83254d76736b30bdae0f4327b8cf1171a306a51387. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/SE6XY2532928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be38b256163279df73adac8e914e7cc1cd778630431551e881236bd8a549e6a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SE6XY2532929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de4e0784112e7ddb2622284ebe590c0413d99393fe32f8addfc648c7f77c047. 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/SE6XY2532931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e1b5603d8f45b840861cd59f958b2e3693f7ad9bf80eff29ec531f9d33c111. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/SE6XY2532932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b8f5e349d1c14bb952387992065fa021ef7df332a7b189331b6525b11f78f2. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/SE6XY2532937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b104dd2c095f983b2878797a88768326952b842822b8ff6dad776d0d61337e. 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/SE6XY2532938.
Be Thou My Vision (Classic Hymns for String Quartet) [String Quartet Version]