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 0xae515760b437d3cb9ba8f93c66f00e6e153c1f6c89fc6574121763d57eb95662. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b4b959a-f65e-4521-ac0d-769f67ab5469.json and https://artists.proofprofile.net/proofs/artist/8b4b959a-f65e-4521-ac0d-769f67ab5469.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Miserere mei Deus, C. 116: I. Miserere mei Deus
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 0x99e6281be63e2a1fa1e735d0cfdee1d4bdd3b787a2bfc3a61bccc9ba57a5d3b3. 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/FR50X2416902 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 8, O dolcezze amarissime d'Amore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab2f7182258080109595408c7a012bf6dcfd18e5133a5e2bbca526e33e11203. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245502 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 10, T’amo mia vita
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28644ecbebf5359e32f9519316ac855f79440d7b8e948b2e911a28a6e44c131d. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BER182245501 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 4, Stral pugente d'Amore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f384a115883d018d4458f0aa4fc02155750f4a8f1fcdfeba8275353bc22220. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BER182245503 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 1, Aura soave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f22e294fcacc4a41813e2c91450021f0ff956c03288fd63eec4c974c911746. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BER182245504 — a six-check JSON result.
Madrigali e canzonette a due, e tre, voci: No. 10, Come dolce hoggi l’auretta, SV 173
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc555a61a63f271e2f5951531aabd365d4e19d74fa8c47e5dffdfcabfaf7f21dc. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/BER182245505 — a six-check JSON result.
La liberazzione di Ruggiero dall'isola di Alicina: Le tre sirene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e664af5b86590b1142c181cda573fa558e23520ed5b5e30651c53448287636. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/BER182245506 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 5, Deh vieni ormai cor moi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78792bfccb4643c3175fcf8de81708c79921329f0f4eb277081c960ee4a0cdd. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245507 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 9, Troppo ben può
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3259e61ac150304e1c2cb035ce55c1dbc210fa2873dd4423d5df0b8e7c4a9eb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245508 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 3, Ch’io non t’ami cor moi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf287b8434033249c8f4e56a9c07134df4cf9252f28c265d3de762aa266b731d3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245510 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2019ddb4d9a60019da4ba33ecea845536e885ed326e3b98f1c27826cb2baa746. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245512 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 6, Cor mio deh non languire
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8967ba9b436c9d1ba95c80cd43e1b48953231664f631fb1fc026aafa0c90d99. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BER182245509 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 11, Non sa che sia dolore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c43705d09e96545de74b7712c2370f7445dc944806ab610d59b02ffa779c89. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245511 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 2, O Primavera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b875e401aaf9856722404ce199be261f5a7ee3344fd892e4486661f0a25dea2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245513 — a six-check JSON result.
La liberazzione di Ruggiero dall'isola di Alicina: Le tre damigelle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8137f3fb14aa7153f78c976612c83369ffba0894262b8ff31d5712abbafd670b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245514 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 7, Io mi son giovinetta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8f78b095ec469e4e817be35c80f8e03df923ecb3fe6ea379a5550b910feac3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245515 — a six-check JSON result.
12 Madrigali per cantare e sonare: No. 12, Occhi del pianto moi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f649eeff106feebe6634134ac332ab9d6c2e7c7b77a3b13e7822dd8831319be. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER182245516 — a six-check JSON result.
12 madrigali per cantare e sonare: No. 10, T’amo mia vita
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28644ecbebf5359e32f9519316ac855f79440d7b8e948b2e911a28a6e44c131d. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BER182245501 — a six-check JSON result.