thumb|Chiquinha Gonzaga at age 18 Francisca Edwiges Neves Gonzaga, better known as Chiquinha Gonzaga (; October 17, 1847 – February 28, 1935) was a Brazilian composer, pianist and the first woman
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55421e6fd2d897cd1102cea467a22195fa2e4afac4c0a8df1041128c7856e6bf. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d1e5bc1-8d69-4f32-9f67-f786faf3ada0.json and https://artists.proofprofile.net/proofs/artist/1d1e5bc1-8d69-4f32-9f67-f786faf3ada0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644dbee0a277267224e1abea3648314840c7d0f30a1776391b69592834def578. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:43:06Z), 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/BRSOS0300218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353f714ebfb180272400151911e29bb39a4f5bc94b2a8d31a3b81caf499d2801. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:50:23Z), 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/BRSOS0300221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a63b85ef32a55bd0d3bd856986a9784f18409dacc7984726554c832fc1c2140. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/BRSOS0300229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70a8ab6853120bfc920b519f566186c18302bedcdb9a50294747e16ab6dc42d. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/BRSOS0300231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7e43555265f2123fec3a38ef6efc0bc8a8ff329abe38ea6405237b186ef9ef. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/BRSOS0300232.
Chiquinha Gonzaga - Duo Piano e Violino - Marcus Viana e Maria Teresa Madeira (Arr. for Piano and Violin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf253f33269efbcaedd46b455f9efb56804e0d80dbc15a5aab7331707d8a67484. 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/BRSOS0300092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf5ee27e065af222f5af87a7f86d66641f654c4283e608a376bf4d149b25a34. 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/CA5KR1832610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a9f48b2a0f5b0f3963d5743f4067f19883e8de1fe215f5e335cda062c04ff3. 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/CA5KR1832611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0fe1fa9374a53912fe9e7393b71a2477cffea8e65382e179ea36aa0445349d. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/CA5KR1832612.
Walkyria (From the Operetta "A Corte na Roça")
Perfume: Chiquinha Gonzaga Waltzes, Vol. 1
Perfume: Chiquinha Gonzaga Waltzes, Vol. 2
Gaúcho – Corta Jaca: Gaúcho – Corta Jaca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901ebdfe508cc6104ec9769a9216cf7cfd1406c0425ec42b9d59a57fed30a818. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/DET902485919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edbdc64fe11261484f4795490ac96d849daa87cc73d81acc62777cb0d1ab6d7. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/BRSC40900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30d2bae04976efcd9ea80970f1356ded43953bdb492789a7ddadfd12f6c3abc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BRSC40900024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5462010508831eb245c637c442441817ce49a20b23dbf6ecbab56ed8404036cd. 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/BRSC40900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21293d0126cd959c6ab6b6f8f3316a5715c1db30fdd5f886fc200ed37308535. 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/BRSC40900028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621e50219101875f3a431d81836c3c62bcaf9fbb0fa4970e7483b24c81df93b2. 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/BRSC40900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe637e378640f6eec60e0a1e79554859fce05f1960ea475465f59b860587f5ddd. 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/BRSC40900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55146686d26a02d4e9a1ce5ca9c2c50bd9ee74f75862ddfea374fa876377f08. 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/BRSC40900031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8152511e7a1d9d2de9fdaf621394f750691872b7a283dae2be4e286e066702fb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BRSC40900033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc257fa8fc8fd3ab8f76b6217baf28a3b3201246a592b896f500fd29afc0bd5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T15:08:07Z), 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/BRSC40900023.
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 0x3e317168e7e215376dd66e29d24cf20c63483f07240b4c3f5a6510d0c59ef700. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/BRSC40900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37086b033d45bcb182d30136983717daac164c090c1cdd52d56e1a9b7581f7fe. 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/BRSC40900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6943ffe68bcbd3f649339b04ab097c477202f6c9a0e26176a6ad6915f15ae6b0. 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/BRSC40900032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4e9722c65735bc53a2f4eaf6c0070069ba3105083f3e2bf03696550a1a39cb. 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/BRSC40900034.
Lua Branca (Arr. for Violin and Piano by Esther Abrami)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50aa2f9291611d03ab21c3dfcb8423e2bf62d6219e3553185e771952fb668905. 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/DEE862500171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0bad3987ff1cf1d4c212abd6bf9c233fc5a3086aa840b576bf7bae0c76aa90. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEA800102015.
Clarinet Exam Pieces from 2022, ABRSM Grade 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc377954f9f3ed87e12db2df0d35a26c4e99bbbe2c4bb5ef02c93e96630818bd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBEYQ2173607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991a48cc1dada56f710c02807dd02dbd9b379c3181a435ea33b20548ef3608a2. 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/USCD40500006.