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 0xd95bc529ab2fdcc06b89ec076e536211db96ffb0b90c8372fda21c32f12d8778. 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/c58de241-8673-4e7d-9828-22a665a7265b.json and https://artists.proofprofile.net/proofs/artist/c58de241-8673-4e7d-9828-22a665a7265b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Tres Conejitos (Sinfonía de Mozart K551)
El Cielo de los Sueños (Contradanza 3 de Mozart)
El Osito de Satén (Geheime Liebe de Mozart)
Duerme perrito, duerme gatito (Contradanza 1 de Mozart)
Es la Hora de Dormir (Variaciones de Mozart de "Ah vous dirai-je")
Cantan las Ovejas (Sonata K.282 de Mozart)
Murmullos de Amor ("Daphne, deine Rosenwangen" Mozart K52)
Canciones de Cuna en Cajitas de Música, Vol.2
Canciones de Cuna en Cajitas de Música, Vol.3
La Cucaracha No Puede Caminar (Canción de Cuna)
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 0x728f08181c0e56cd83cbebcf440d608598ce3519c358aac35d578a6db262398b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAW2305536 — a six-check JSON result.
El Barquito Chiquitito (Canción de Cuna)
Un Elefante Se Balanceaba (Canción de Cuna)
Canciones de Cuna en Cajitas de Música, Vol.4
Canciones de Cuna en Cajitas de Música, Vol.5
Cantando con Mozart las Canciones de Cuna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ed31cec66f05ea79e901b445b3afd0da707af527b718ff309fd80646e6426a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2333544 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f004b3c66908cdbab036e494b40afe6823da6f7f57ad2c39b0b9565388c5d70. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEQ2378671 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201b6ca0b0880b183f21f10a38dbc9b5d39c910ffc98404c20c757e5a102bc16. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEN2393404 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0728d16e97c36995696dddf7043457f4da539177e19cb7c292acd951bdc2322f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFP2395179 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f6d1ca3c42041ec93ff15b7fe9c645230a49f3e35ac8e2baa4f3484cd36a4d. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEN2394381 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88722bed58451880cc9a71a10dd608d22fc628f9867e24be8b737a59f309d2ba. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6F2309464 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33430dcab7390580abe48f372ca47e7d73397f92bb367edc1ae9e21b92940185. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6F2310971 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0da78aeaa75ee2051aa98dd27e9385de9a190026f2fdd3ed6e5e82e1e6de90. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAU2382868 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd5676c9a7a10ce1d2589b6a8de0dd07de0112c26e9403ef8f04bf1796cf5b9. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB22379209 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a7ef0cd9093175e00b632683a75b9c5ee986f17e08be995166268bf41a3265. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62317475 — a six-check JSON result.
Patito, Patito Color de Café (Canción de Cuna)
Canciones de Cuna en Cajitas de Música, Vol.6
Debajo de un Botón ton ton (Canción de Cuna)
Canciones de Cuna en Cajitas de Música, Vol.7
Duérmete mi Niño que hay Mucho por Hacer (Canción de Cuna)
Antes de Dormir Mamita (Canción de Cuna)
No Me Mires Así (para un bebé que no quiere dormir)
Voz y Cajita Musical en Canciones de Cuna
Duerman Mis Cachorritos (Canción de Cuna)
La Vaca Lola Quiere Dormir (Canción de Cuna)
Los Pollitos Tienen Sueño (Canción de Cuna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77eafd822b63bf0ea377941fec638058929bd5daa0b959c9c4d25464d092daf. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBA2441179 — a six-check JSON result.
Flauta para un Bebé Dormilón (versión flauta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09bd8030c39483a90161f45e4f273784e49b710f5f1992ffbce3d94c15346372. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ762494887 — a six-check JSON result.
Canciones Para Que Bailen Los Niños Vol.2