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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457cd73a01bfcb59f950ad2c088741d1351b13a8daf3e17cd46d0838b6fa7b07. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72348b39-c778-431c-9395-6c0185f561fd.json and https://artists.proofprofile.net/proofs/artist/72348b39-c778-431c-9395-6c0185f561fd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata No. 1 in F Major, ZWV 181, 1: I. Adagio ma non troppo
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2f0be475783159c46ca7629ddfb39dcc7fb35e2eb066d7959e45b8578282b9. 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/NLB152400426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede24564c6559b4e407ff57fef9282359e8ce64aed8a94b319aedbe5c0649ccf. 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/NLB152400430.
Sonata No. 2 in G Minor, ZWV 181, 2: I. Andante - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e604e7c7b446ec9be5786d10588695ee51e789cd4884e200efa80996e78ac48. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLB152400431.
Sonata No. 2 in G Minor, ZWV 181, 2: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85cc24c7bd391e06448cb490cb6131c6cc4261f99165f050a2e945ee64019f8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLB152400434.
Sonata No. 3 in B-Flat Major, ZWV 181, 3: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f51ed63c248a474e38bb17f89e0a455c1076b008ffb5a5ea0f8176e7942f69. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLB152400436.
Sonata No. 3 in B-Flat Major, ZWV 181, 3: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff564820a482e10021783697c31477ee959febb5567b3001cadf2bd75b3069ff. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLB152400438.
Sonata No. 1 in F Major, ZWV 181, 1: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3df8ee09d82e49949416c99638c7c67b0b44f4068a88b1d81119ffbb1b2ccc. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/NLB152400427.
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
Sonata No. 1 in F Major, ZWV 181, 1: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a0259e85e6aa2399277c08e245c022dc924ed82097b6343cc68053c19ddae4. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400428.
Sonata No. 1 in F Major, ZWV 181, 1: IV. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd24e975dc59ee906cad78d53dc12f955e070498a057162b2fc667fb371b077. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400429.
Sonata No. 2 in G Minor, ZWV 181, 2: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835424fdaeb8db0a5bee157676009c282c96a3d13e0d58a4ec19568ff450e0da. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLB152400432.
Sonata No. 2 in G Minor, ZWV 181, 2: III. Andante - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce90f48e2cc8e5d7358e38a7d3646ccbce1ac1e787eb1a5665e9304d4bacfdb6. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLB152400433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdaf165278e1de6967c2593e165d384244ee0c3bd0f621512ac1d2e74e35ab7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400435.
Sonata No. 3 in B-Flat Major, ZWV 181, 3: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb18c62baeb4229bf7bb2e6dc9c6ab97aa20ce3835fb8ad6518993752e8bc2f4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400437.
Sonata No. 4 in F Major, ZWV 181, 4: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3418c8b706970c61c64d67b9bacfad302ede10fd452e9252e35782332b3eef. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLB152400441.