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 0xbeb4517e3e1662fa27cfef74d42763f25392e2e13f5664e5d3207419fd7426b2. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72e4c18d-cdb3-4804-ad5b-3d5482be27a9.json and https://artists.proofprofile.net/proofs/artist/72e4c18d-cdb3-4804-ad5b-3d5482be27a9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Scarlatti, D: Mandolin Sonata in D Minor, Kk. 90: I. Grave
The Collected Recordings of Il Giardino Armonico
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 0x171cea659eff0b50e1f8af27d7c3f665bab67d7b17088d0323a47447a21e07df. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEA809316101.
Scarlatti, D: Mandolin Sonata in D Minor, Kk. 90: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1199049fe93c2232355f7ddb76dcba09fd5a606136846bc1f099ac0d2772550a. 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/DEA809316102.
Scarlatti, A: Sonata for Recorder and Strings No. 2 in A Minor: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6fde4d42bd6e39aea6e7584c3a7c69f91d0c1d0e73500748621bf3872bcaed. 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/DEA809316301.
Scarlatti, A: Sonata for Recorder and Strings No. 2 in A Minor: V. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae546855f35e877be9e0fee94e9bda091b180cfc792d308f779988658bb2adb9. 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/DEA809316305.
Vivaldi: Concerto for Two Cellos in G Minor, RV 531: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78ccfb3cb326f228da07825fd88d47077adc49da57c9bc947f4f67174a924e7. 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/DEA809599458.
Vivaldi: Concerto for Two Cellos in G Minor, RV 531: I. Allegro
Vivaldi: Il Proteo. Double & Triple Concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9683a4dcaa2e6d14723dd59587eaa668d4f2924bc02b4c8e56eb1c8498cd7b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEA809599457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78ccfb3cb326f228da07825fd88d47077adc49da57c9bc947f4f67174a924e7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEA809599458.
Vivaldi: Concerto for Violin and Two Cellos in C Major, RV 561: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22652195a3c979c198b44733db0e9c1f4659ae9c84d76f3bc429c03fc1397c9. 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/DEA809599463.
Vivaldi: Concerto for Violin and Two Cellos in C Major, RV 561: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22506ab3f1458adc815e1050c760203d1d7a13b64e65ebd6b3ed64dfc6ae84d. 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/DEA809599464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78ccfb3cb326f228da07825fd88d47077adc49da57c9bc947f4f67174a924e7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEA809599458.
Vivaldi: Concerto for Two Cellos in G Minor, RV 531: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b5a3fece3b6e7ced2e66713f1b5ece96cca9f2012191b1d561a653320db5ec. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:12:10Z), 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/DEA809599459.
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
Scarlatti, D: Mandolin Sonata in D Minor, Kk. 90: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef5ad102d42e082509180450f76051174232723cb9d4a83accf88a7b56ec30e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEA809316103.
Scarlatti, A: Sonata for Recorder and Strings No. 2 in A Minor: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c06ae43dbb801c21d52df1ccf3e1805249ef9e5261612b189b4116cdf5b837. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/DEA809316302.
Scarlatti, A: Sonata for Recorder and Strings No. 2 in A Minor: III. Fuga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455d1b7548fe88575d2dc3969c5992ea2bd73e2e82230a0f5ea9b952e0afbd5d. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DEA809316303.
Scarlatti, A: Sonata for Recorder and Strings No. 2 in A Minor: IV. Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2641530d647858af4b305d56f449725c3864151b1198836fea07d761040f36a8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEA809316304.
Vivaldi: Concerto for Violin and Two Cellos in C Major, RV 561: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a524f3729778efa0e2130055be3fe2d95496fe6176f72d4caa185bedd66ff4. 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/DEA809599465.