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 0x93feab96f5cd6feacb10edfd454fed7aeac333628b6522576e59d0a3ed5ce753. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/102a2da9-ea7d-43c5-9ac2-4188cf09fe28.json and https://artists.proofprofile.net/proofs/artist/102a2da9-ea7d-43c5-9ac2-4188cf09fe28.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Fanciulla del West / Act 1: Che faranno i vecchi miei
Orchestra of the Royal Opera House, Covent Garden
Chorus of the Royal Opera House, Covent Garden
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 0xdad0f63b83d27214d35c673d07499f30cf7c0bece4295d6db48efc117c447142. 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/DEF057730513.
La traviata / Act 2: Dammi tu forza, o ciel!...Ah, vive sol quel core
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c708b5aaba0ee65eadd3a56cb1c4a270ab61f07b934d5e6ed03db5eaf14b62. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077930113.
La Fanciulla del West / Act 1: Hello ... Nick!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8891a6309a39970546765c8a585cf8524d779a43acd3f215d9829b22f9c026ba. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEF057730520.
La Fanciulla del West / Act 1: Jim, perchè piangi?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79438f0bdfbd3379351f7f4e5e0922647381d3702460b7ba4a8a1c73993684b. 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/DEF057730521.
La Fanciulla del West / Act 1: Hello, Minnie!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619e6c779ab369354ad7e5bdfb1eec05fe6744a8366caa72c6e71ce94c17fa3b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEF057730525.
La Fanciulla del West / Act 1: Andiam, ragazzi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bd15497e6a46b3760073d5147914429422dba8433cd3d448d5008cbd81b859. 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/DEF057730522.
La Fanciulla del West / Act 1: Un poker? Nick, gettoni!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f65dd013676d3848e630201f18ef36edf8d1735c754b73d0c5154c6ac016ba. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057730523.
La Fanciulla del West / Act 1: La posta! La posta!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb180869a750de5825acbba775fdba68a59238b1af9428135718c21a63c93473. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DEF057730526.
La Fanciulla del West / Act 1: Mister Johnson, un valzer?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39cd5d12261ecc8d52e167bd8f3bfc0f8e5a1acf17013fe68047f9fea96c877. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/DEF057730531.
La Fanciulla del West / Act 3: E anche tu lo vorrai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d4e1554e53d70b8faffccbc62bd121711c3c2a48a5682a80e31e45781ae093. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DEF057730511.
La Fanciulla del West / Act 3: Le tue parole sono di Dio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03727788a8d3da96cb8ea87552e9cec84458acc59a5c379283a22da8f193788. 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/DEF057730553.
La Fanciulla del West / Act 3: Ah! Ah! Ah!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4b1e217b188e6c4b601d8ac7e4cc959b18cea173864b81349f4db752525ccc. 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/DEF057730546.
La Fanciulla del West / Act 3: Risparmiate lo scherno
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701b3c7ff2faa1bc7b630e7bcb671ff8380b63d0c1feb0378ddc3e1ab431067d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057730549.
La Fanciulla del West / Act 3: Ah-Ah-Ah!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794a25fda116e87db12432c310151ba473a772e4ccf935813debd7f321f24176. 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/DEF057730551.
La Fanciulla del West / Act 3: Basta!'quando per voi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637de55dc065a55d31c9b35739d2986a8f7f856a5619a54c0a7e413df72f6ae7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEF057730552.
La Fanciulla del West / Act 3: E così, Mister Johnson, come va?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda25c97cac835444b4f0fb58d6f1c323e3b6e1d10b5c60d6ac858e8eb9bf438. 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/DEF057730548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da093787977ade974a87361a8cc161432983578207b1a60b907488c923ecb34. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/NLA507401313.