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 0x1364581cd7895e82409e9b3111f689a419da468ee9b5c0f16dc14eda0364ad29. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a7dc84b-972a-40c8-8090-e5ed79b301a2.json and https://artists.proofprofile.net/proofs/artist/7a7dc84b-972a-40c8-8090-e5ed79b301a2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto a 5 in C, Op. 7, No. 2 for 2 Oboes, Strings, and Continuo: 1. Allegro
Albinoni: Complete Concertos Op.5 & Op.7
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 0xf2b584fedb94e2f79d8eaf5c8b6657c362402f9ea253c72be74540f44b0239d2. 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/NLA507301178.
Concerto a 5 in C, Op. 7, No. 2 for 2 Oboes, Strings, and Continuo: 2. Adagio - 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602b45be65b82222c1d03189962a86da4938a2fed31845c6189a44313f1c0126. 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/NLA507301179.
Concerto a 5 in B flat, Op. 7, No. 3 for Oboe, Strings and Continuo: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedef8293e9151d19aba1df18d21a2b0bbfb41dcc8e7790056f2d1def9a006a6c. 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/NLA507301180.
Concerto a 5 in B flat, Op. 7, No. 3 for Oboe, Strings and Continuo: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bd9844078dbcca479b14aae74b264e5f4fdd03248a3eb1f4ceedbf4028ea4d. 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/NLA507301181.
Concerto a 5 in C, Op. 7, No. 5 for 2 Oboes, Strings and Continuo: 1. (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c34f059778ea18d96f3e3f26d14028ff3e0e319f0282ad1d63dc718ab178b72. 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/NLA507301185.
Concerto a 5 in C, Op. 7, No. 5 for 2 Oboes, Strings and Continuo: 2. Adagio - 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf3a89d994f87e03b379433d61f914c511e6f332a7258578cb92577ca19d856. 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/NLA507301186.
Concerto a 5 in B flat, Op. 7, No. 3 for Oboe, Strings and Continuo: 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612bf43dec0007138e65f2a61dc91072da46c03b20b7ca4a4ad5d39a42e8b054. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507301182.
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
Concerto a 5 in D, Op. 7, No. 6 for Oboe, Strings and Continuo: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce9b441210517aca25c7fa821ec5eb2f59dd0d4f2080b2f8da5491f17aef2c3. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507301187.