thumb|Alan Titus in 1971. Alan Titus (born in New York City, on October 28, 1945) is an internationally celebrated baritone. Life and career Titus studied under Aksel Schiøtz at the Colorado School
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 0xbbefc41e9c81118d4b86af0ea29455106d008d016a333411c092ddb628e145c2. 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/65281dc0-17f7-4915-be67-09c316864790.json and https://artists.proofprofile.net/proofs/artist/65281dc0-17f7-4915-be67-09c316864790.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La bohème, Act II: Da quel suon soavemente
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 0x18a00b1385450165d2d8087f4385f1fe745530cf7a6fb23ea79a4eb7163e3fed. 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/DEB958202311.
La Wally: Act I: Ebben?... Ne andrò lontana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f77bb81290001149bdf9f59e8f68e0742410febb13d66f3ab0a52fa7e559cc. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEE479000123.
Mozart: Die Hochzeit des Figaro (Höhepunkte)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f1e78f539c5ae79f5872288335c14a2a1283bbff6891d23967a330661aa106. 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/USBC19000235.
Le nozze di Figaro, K. 492: Se vuol ballare, signor contino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093c49efb0fc2a879b6b3b53b28f0ab3d2c865fa25f62210acf49ff8cedac8cd. 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/USBC19000239.
Le nozze di Figaro, K. 492: La vendetta, oh, la vendetta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa515e4cb190d28d0b323b1545eb6755d37efa9b2100862fb61859ae0a0ae663f. 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/USBC19000252.
Le nozze di Figaro, K. 492: Non so piu cosa son, cosa faccio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a05b125093b19545534fd6f5f5addebd466a08aab706a5bba234549db6b186d. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USBC19000240.
Le nozze di Figaro, K. 492: Non più andrai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5eb3ec23f502ca0455196594cfcb03b971e62e68f19f77358b90c77da7be6c. 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/USBC19000241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b3e485475e8d56644b599e0c4b4aaacde9ad0d9ef743e7e23c89f835b68633. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USBC19000242.
Le nozze di Figaro, K. 492: Voi, che sapete
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97826dca77ec1e8e1befb592bb6969b63ca52ac3b5cf17c30b1bb0869c0f81c. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USBC19000002.
Le nozze di Figaro, K. 492: Crudel! Perche finora (Duetto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be33154ffc2c45173aaa3bc22a38e05b57636600a72c80166c9d9b24980a01e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USBC19000243.
Le nozze di Figaro, K. 492: Hai gia vinta la causa!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a274b7fae4280cffe3723b6557024d7636181366778cde4d12cbc7a389a698. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USBC19000244.
Le nozze di Figaro, K. 492: Vedro, mentr'io sospiro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90dede895764c0be07b19000512d3f8d3dca62cd49ceeeaf155d0d99da2c262. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USBC19000245.
Le nozze di Figaro, K. 492: E Susanna non vien! (Recitativo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18d0c37ae019a9b38db12f00af58a6cce40c6a4dd275c38c75fa7785e2b1cf5. 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/USBC19000253.
Le nozze di Figaro, K. 492: Dove sono i bei momenti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7779f36bf4eeb34c85405196424875a87c7f6230e13dbe4e8c593e1ee7ffbe. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/USBC19000246.
Le nozze di Figaro, K. 492: Che soave zeffiretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28110603952912a8aed2a9fd931946107d455704b5b7aaf5045714a4f19eb9d0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USBC19000247.
Le nozze di Figaro, K. 492: Aprite un po'quegli occhi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55fe79368a9246453959a9dbefd4d8adf8a1109695b962909ab59c97b1e00c11. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USBC19000248.
Le nozze di Figaro, K. 492: Giunse alfin il momento (Recitativo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc524453d1d7700ef339e70c0ca609359526473b8a85815b55014c18c66f3b8. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USBC19000249.
Le nozze di Figaro, K. 492: Deh vieni, non tardar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2422e04751377d07df7072c7cb2712dac0b3f0ce7523b69741ae1c878daaed. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/USBC19000250.
Le nozze di Figaro, K. 492: Gente, gente, all'armi, all'armi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76bda13b567f3443f3083af04e81c6a14c8cfb22a3a45742e247bcf365f56a3. 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/USBC19000251.
Mass - A Theatre Piece for Singers, Players and Dancers I: XVII. Pax: Communion ("Secret Songs") - 2016 Remastered Version
Leonard Bernstein - Soundtrack to a Life in Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62922593f1b5b0159120dd9794375e17af8f01efd9ade49cc9e4c0708b42a4b8. 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/USSM11605272.