thumb|The Balanescu Quartet at TFF Rudolstadt 2013 Balanescu Quartet is an avant-garde string ensemble formed in 1987. Current members are Alexander Bălănescu (violin), Yuri Kalnits (violin), Úna Pall
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 0xd1a03e7c9b60f5bd260ed5ea6350a7dc10a906681dd825b5ad75ac36093834ad. 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/435a1921-28e9-4166-8e04-9c20b7a65c56.json and https://artists.proofprofile.net/proofs/artist/435a1921-28e9-4166-8e04-9c20b7a65c56.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Byrne, Moran, Lurie & Torke: Works 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 0xe5c69f20d7f779a8dbdf2c5cf55c343f5fc9a664c50abde56ca6b1ff1cc42184. 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/GBF079210040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bf072eb4b81c323397354afb1054d344102988bbe0f6794dc9e3306bc7041c. 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/GBF079210051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e33ecdebc743cb481d72c3cbaa412f3857e8984282685dae8a02c2561b9e81. 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/GBF079210052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9d315b813859a2d14825efa94e83ad993c3a7c4a97e6cad1859886e8df61ed. 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/NLB361100301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb151eb055e70de02710eff32c6530384f5e927ec63bb0926f8df5c07eb3b61e. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/NLB361100313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fe0d32f5447afdbf04917481cf65ac0a8e8e9047dbeb05f6e7dec3e4789329. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GBAJH0402847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654e634f45945fb934095a2bf4c60cf0be068091dd33d52787d39da5b1b9db85. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/GBAJH0501366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8f91109d5afcdeb0f16e9b1074653628d2f033bb66d63fadef922e716248b6. 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/ROUM71500085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a96f7c9d76c7dbf853d098f48e64fd95d5f5ea6f15ca8d96836082bb81cae96. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/ROUM71500087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a90fdfde3072e183b00a8e12e896c5d12d01f1087e5c5504cddb1cdb12370c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/ROUM71500089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14c618c05abe450361e37aaf47ba025d7bdb5929291d2cc258cee6f08656555. 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/ROUM71500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c39d5d78cab79398829e37bbffaa61c829a059e08c94c717fa26deba2c54226. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/ROUM71500075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a020fd19386d5887d68a837e496669cd2fa7309ca9e2407b5347ac0f055bc7. 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/ROUM71500076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd262010c1f8c18b1951d207af3c540c1d8fa128c53f6dfab3d161d8f33834293. 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/ROUM71500079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb526f8e07f9d5ffccecda1cbc53de2a486e44a7905e31645be0690310f58e484. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ROUM71500083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4700e710678baf786a66c2889af40f07761b7c6f3063e48dc1610d17f1bb16. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/ROUM71500065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d53f39aeaf9884fdc0a6f075da71429cff09a72995339a53abff9e208f3010. 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/ROUM71500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e795d5a85cf6ab20f691c803e7948a409f9bde5ff5afb1b5030d7f6cae4db9. 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/ROUM71500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c9d1ace876193aeafee1941dbf640cb08bab58842d7ce6b338409d7bb998d2. 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/ROUM71500054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aea41b5c4f69f8aaecf1abc478a3782f556248a90a89811c161c1f1a15c8006. 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/ROUM71500062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d011ac5aaa33ff3f42d0c531cd92df9884f9df3a85ec2dce02e5b9501c4c5d5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBF079510792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20321cb686e6b9d7ba37b582f09411c5792345ce9d4d74ac6df1ee2ed90f2b3. 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/GBF079510793.
Mistress Mine: 4. When That I Was and a Little Tiny Boy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580de94071238c8680498bcf951453e5d825d77a15387b318998386a7f2f3b8f. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/GBF079510794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213652e2db0074c4dc9922f2a2e8bd8dcdacd09a79dc68ccd0cf09bd0396b5e3. 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/GBF079041709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93b27459b98de9eb3385d52f61811f8a9e0aa0e674778bab2e413852f02ab50. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBF079041716.