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 0x8c7d80b272e7c553a9142ad5837f77dcce674cb5e2ec2752f01802303b61d3ad. 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/0f822cd7-d1cb-4b07-bde6-82d308d4ac67.json and https://artists.proofprofile.net/proofs/artist/0f822cd7-d1cb-4b07-bde6-82d308d4ac67.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x197d7487a20c3204ad0687415f304c3205ef96ee9b8e288b5e06d5e71b405ce2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508906215 — a six-check JSON result.
Tosca / Act 2: "Orsù, Tosca, parlate." - "Mario, consenti ch'io parli?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c24fadfe94e082dbf80415f948fe5c1c6df1649fee36b26a6016cce080f8b7b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508906221 — a six-check JSON result.
La traviata: Act I: Libiamo ne' lieti calici (Brindisi)
The 50 Absolute Essentials of Classical Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5698dcf40b842975969ed35e30b7a94fb3c45ca64ef02d57a789fd354bdf1e77. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USSM19200827 — a six-check JSON result.
Tosca / Act 2: "Ha più forte sapore" - "Spoletta è giunto"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac83720f467d2b169f5f1ae61ef3b06faab0e826744a16e78471d76078b516a. 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/NLA508906216 — a six-check JSON result.
Tosca / Act 2: "Sciarrone: che dice il cavalier?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f57f4d656fc2f1a52f187f148f51da161cca12ee0021c4869847431abd0b7b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508906220 — a six-check JSON result.
Tosca / Act 2: "Nel pozzo del giardino. Va, Spoletta!" - "Eccelenza, quali nuove!" - "Vittoria!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f87cab1a36c48d61cf3943eb2c60f6c2c2104bf3b655fbe8f2204139df65975. 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/NLA508906223 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9429ed00f0b828239762224016823a067cca987d435b2f463e42803233b1edc. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508906240 — a six-check JSON result.
Rigoletto / Act 2: Schiudete, ire al carcere
Orchestra del Teatro Comunale di Bologna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c5b732875da6e5b7a6423a4060dfcac9c4e9a4b4060ba12942331cd112768f. 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/GBF078940421 — a six-check JSON result.