The Flanders Recorder Quartet was a professional recorder group based in Belgium. History The group initially formed in 1987 and became more well known upon winning the 1990 competition Musica Antiqu
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 0x59c6f2f44ea77cb435a3b7823f543b229f4f9efff856ee9d66f590b02f88bae9. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b255d5d4-73a3-4835-8396-8f84586d304b.json and https://artists.proofprofile.net/proofs/artist/b255d5d4-73a3-4835-8396-8f84586d304b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Deutsche Barock Kammermusik VII: Mit Flöten Chor
Armonia di Flauti: Bach, Vivaldi (Arr. for Flute Quartet)
Recorder Quartet: Early Italian Recorder Music & English Consort Music
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 0x49709ab0a172b8030bddb88ea8850bda7652f10ec3f341a73017c088a80eda19. 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/NLY331502465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad101ddb093ddff89d21b69d2b89a1c610537fc44320d70cab7378b3e2990e96. 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/NLY331502466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c517a82967aa7f596383a2dbbd44bf3cadf8ba0d414f548ba9b19d54dd43ae. 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/NLY331502467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88752419f6bd52483d7aaf25117405b0784612b89054293a07e2f7de0297db4. 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/NLY331502468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578551df220dfcb9b90512db427dda6bb27ff6268311643b488170a02cea62e5. 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/NLY331502469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa697ddf2815527572ba5a7f4c50eaeaea5b249f2d1f1e61c1bd8f41334e2bc0b. 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/NLY331502470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bcc13ba8515f008168129122ecba7f09e15091644edc3c70a4a715aaa2425da. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLY331502471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b68154dc6434a1e564a058d4b1535526e6bf2f0cbef52394ce79048536f94d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLY331502472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee54fae0c8e5c1f3e3840aa158b9b369652e5e485809562a740788ead46f27d0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLY331502473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b57516d9958bc07ef137ad2443ec0f6dffe022fbdabb0bd7334e017eb9d45d8. 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/NLY331502474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcca9fbf6542d72c26d31d3827999ae1bf8b0f321a8c6a68641fac117c241749. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NLY331502475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124f5dd38cd1c97bda5ddfeb70764c0ae0b92a08be0738e88e8e73f13686490e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLY331502476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fc82efe345acd5095e08b87f524e47f639f78d13c70d1ef40c69081ca653fc. 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/NLY331502477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8c1b210607ed28d41b3cc4c925f72d060344df689e0f6dd7cc34c41227e189. 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/NLY331502478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f33a72f4460caec91fdac5e8a58fec64fe7b10e612661f05da8e0b9b4a072e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLY331502479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb1d2cf83c247ed328fc4033d704d0b839729f009b24b91b9a60b4705b3c149. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/NLY331502480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c87338f8eacd312d9c89653bc45db83a19cbd424d43eab6dc18bcd06147335. 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/NLY331502481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873d6462a6f6c06411cfc8b5153cd6a433ed02acb3ea81b664a29dc331e722e2. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLY331502482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e4ee7a7d471969ade023b82c62f6f57e3642a1088d18a60518b734e1af1671. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLY331502483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42429bdcaa8bade1e4fa90f9ba1811d9437be62b606ab4b7d1402f508a191a72. 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/NLY331502484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b04f65bc5f64208019fc0be738bffefeec1c908b4a08f5da73015155673157. 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/NLY331502485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b3fefa512c4586b048e4818bc16e5449031af1f58bb5fe3fa87d418109c451. 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/NLY331502486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb526a13fdf9cb73c59d48b6e5f52b106be93f247c9853f97f4af612f796625. 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/NLY331502487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7965f3add13ade22960c2d38afbc2b8d84c00c456269b5fe02af5f6f70212f15. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLY331502488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29485613e460e4d47c1d49aab0ac6a1038b6052b49535c19ac0b88d915e98bcf. 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/NLY331502489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa217a64435be67047d7931013cdffa2a2ab2d8b6931df3947a6bcd2293af26c5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLY331502490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b97e8dda3e085405f9890725ded6eb806963341c729fcf73ec064f2fd8331c. 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/NLY331502491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e49eecb3354d6f7031c02f17e1741553f7c86b7299bf94ef11a5675880604a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLY331502492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1b86724a1582f94c48fcfbb624661a15bfa269ecff4ed7bda8810b64b782df. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/NLY331502493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa41239a83fee0197e212d11d883596358b4090b0d2091b7f4f18a9082a997fa. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLY331502494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9cac3c80bd0666dc3e979c9491488d9c25ef5c7ef1049c574f72ff892081cae. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLY331502495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460288f00da6b9e87186d58e56a4d37e133df93685f76d15425354e3a63be4e7. 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/NLY331502496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d541e09ddb5412e2612b095111835967aa712212cbb5d538d05eb32ab5da9b. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/NLY331502497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ceed5e0f4e8daf189e8bc38b193d43a564fc748a5270024b6b61a9369df0ac4. 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/NLY331502498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced6833142f2831b42939607c057cbd793bc52a5ad1f8e2b78de31491c978e1b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLY331502499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756b0c82fb25e5a6d665161b9002aad39097abf7a3e55354476b169fc9aab22c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLY331502500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd098e9ee0871b1d25db4bb2983a67d2993a649094a2cd1a76fe53996c0cfe5. 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/NLY331502501.