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 0x74805baf416d608d9989545cf213fd8bbc4db29b576b5869546ffe8a538c529d. 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/55e4ad24-9b95-428f-a5cc-1659df2ef5bc.json and https://artists.proofprofile.net/proofs/artist/55e4ad24-9b95-428f-a5cc-1659df2ef5bc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
The Four Seasons Recomposed, Spring (After A. Vivaldi): I. —
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 0xbf4b2b0f90aebf2bd061ae8e87c005e75941e55cfcb123332688806f4060064d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS1700277 — a six-check JSON result.
The Four Seasons Recomposed, Spring (After A. Vivaldi): II. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fda3d58d171b4453855ef8ed9da0574609ed126f2b469e5cbf0a464539a2617. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBYDS1700278 — a six-check JSON result.
The Four Seasons Recomposed, Spring (After A. Vivaldi): III. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc12a0d87abd8cc929c28253b1cc60627cb4b0a1e823320958a1d12ef4e75cc9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS1700279 — a six-check JSON result.
Königliches Thema (After J.S. Bach's Musical Offering)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041a53c61383e93c4feba4839bac3814dd736d4d60c61c6003a76aee9b4696b6. 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/GBYDS1700280 — a six-check JSON result.
The Four Seasons Recomposed, Summer (After A. Vivaldi): I. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e76ca21d808dea5abcb973e4a08c1ba131300593e54da7cbfc666054e3c4df8. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS1700281 — a six-check JSON result.
The Four Seasons Recomposed, Summer (After A. Vivaldi): II. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c2b4b23f6a062ed16a6e2d9ddcd4d38b1cdbde68f846178b318e971ef0a30c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBYDS1700282 — a six-check JSON result.
The Four Seasons Recomposed, Summer (After A. Vivaldi): III. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedde7de4c6e240f6035528c78f6351f06106c6a9d6179e9af5faf4708894bad3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBYDS1700283 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2edfa9eb81f1a2a6dd677fb29149c9c53ef1e4648754687863f5cfb3032f98. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GBYDS1700284 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb929b7b70a7c3a918cf1fdab04e6fb63741d1616a6df9f48967b1d64790129a1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS1700285 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ba07a25e4467435dfe8703dc8133c4649872f6a7c460a75a1ceca5e6b2069a. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBYDS1700286 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00a04f0de3b09b871b46bdcbb00e980a452b8836702b880337e541c38f58d3a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBYDS1700287 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaee6c40174ad93cf222219cf95c58d1968fa4788086a52dc65d67138e8aec74. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBYDS1700288 — a six-check JSON result.
The Four Seasons Recomposed, Autumn (After A. Vivaldi): I. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6ea32022b640ff563cd3a9823291271985551a5f7fcb0ddad68688b7dc8de9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBYDS1700289 — a six-check JSON result.
The Four Seasons Recomposed, Autumn (After A. Vivaldi): II. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17ef83f25a20cce665e0e77b669f0ac77def48e2f1769a5b9c3dca48fe84fcc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS1700290 — a six-check JSON result.
The Four Seasons Recomposed, Autumn (After A. Vivaldi): III. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4cd77f6b73c9e088d406aaa51672ae09f515002abdd47c7ef66b26cacc1a05. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GBYDS1700291 — a six-check JSON result.
Variacions sobre un tema barroc (After A. Literes's Acis y Galatea)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68675804cc5a4e542dd2b294f54af30ee6ad6e1887729131c57550f1750c0b2c. 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/GBYDS1700292 — a six-check JSON result.
The Four Seasons Recomposed, Winter (After A. Vivaldi): I. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0fbcaf024dbe81d2d80d00f6eb912986110374117d1111b8876d7d043cdc7e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS1700293 — a six-check JSON result.
The Four Seasons Recomposed, Winter (After A. Vivaldi): II. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3423a51032b175650ec6a1349abe1150e8373d6b619025b0e4d4e410b79ee1. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBYDS1700294 — a six-check JSON result.
The Four Seasons Recomposed, Winter (After A. Vivaldi): III. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c387346e89d468dc48b1b90760e23a69c7af1d8cfc8d35f8acdbddd1b3390f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS1700295 — a six-check JSON result.
The Four Seasons, Violin Concerto No. 1 in E Major, RV 269 "Spring": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f75240b3d9610bf24e34e9e9f37e78c7e8dfb118e1694bdff2d47bbf7adb977. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBELX2107563 — a six-check JSON result.