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 0xf94e4d0b9746bfcabfffca397cb462afed9846ca8c6e2948dc776ce4a289d930. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35d1d477-81a2-4ba5-97a1-914dffac4fac.json and https://artists.proofprofile.net/proofs/artist/35d1d477-81a2-4ba5-97a1-914dffac4fac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Concerto No. 1 in B Flat Major K. 207: I. Allegro moderato
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 0x6f606cf9b578809faa11cd33383be7c5d405481efb706bc831438879a95ad66b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP1700284.
Violin Concerto No. 1 in B Flat Major K. 207: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa647642f89e4281e7e0835e2bfbad4b9b707bb0413160d174bcd87f10bc1dd73. 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/GBPCP1700285.
Violin Concerto No. 1 in B Flat Major K. 207: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9643bdd9575ee9073ee2f54fd2e32c28a4eada53c7b3a01862795b988ce3b4. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBPCP1700286.
Violin Concerto No. 2 in D Major K. 211: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23109f3453721fb9f9c46015e3db87f701d39a19fd954615a706131af9b51e31. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBPCP1700287.
Violin Concerto No. 2 in D Major K. 211: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d69938146264a8c6750a4924c6e646edfc1627e04eccece05a1926cfc11de2d. 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/GBPCP1700288.
Violin Concerto No. 2 in D Major K. 211: III. Rondeau – Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58fa7d90967ec51f8a5da26f8893b39aafe7d7a514ae528d3f325734f63dc554. 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/GBPCP1700289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2d2f44973f8dbe9309c9e623aa86c9b166c36aa3b1e8562b796f8ba442dc58. 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/GBPCP1700290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d56d87e0a0fa9af227340f1d2151363712e4af5e09b66ceca8440083e72ecd. 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/GBPCP1700291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb31560e531939f5833fe755356e12de08151500f90d1849b506d2bfa5da61d7. 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/GBPCP1700292.
Violin Concerto No. 3 in G Major K. 216: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4835b81b33c0c7eb97b3403497adb9a259788de64a6e3e7b1366ebfb7085d4e. 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/GBPCP1700293.
Violin Concerto No. 3 in G Major K. 216: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb239d0c6b5f5c11809700dba5f5eeac1a0854ec3ee3c93dc9fd8babb469e89b. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP1700294.
Violin Concerto No. 3 in G Major K. 216: III. Rondeau – allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017d8a7c25d46ecac7f88b805b2e38823c3f452618deb68890a90a0a94b61928. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP1700295.
Violin Concerto No. 4 in D Major K. 218: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fe55c102b2e378d83cdc5f85bf81c8749559e3a60a5589126d6f758b7cfbdf. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/GBPCP1700296.
Violin Concerto No. 4 in D Major K. 218: II. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba60286c890ecd5f8c03f2f637f6737b648cc66116af1ada043da021404f913. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GBPCP1700297.
Violin Concerto No. 4 in D Major K. 218: III. Rondeau – Andante grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe074b80f27e33843bbf7b556cfba553eb8ae6e1ec1c193e4b1ba2b588903bfb9. 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/GBPCP1700298.
Violin Concerto No. 5 in A Major K. 219 ‘Turkish’: I. Allegro aperto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621871356ba2cb7edfa6ac392dfb6cd62979e6e431d02861bc2cf323ebbf97e0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP1700299.
Violin Concerto No. 5 in A Major K. 219 ‘Turkish’: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c98d3ced87eae85eb5fedac5e4f87c4e4e253b539c4d085f9d06b5bdc16c583. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBPCP1700300.
Violin Concerto No. 5 in A Major K. 219 ‘Turkish’: III. Rondeau – tempo di menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d27755c614759010258e0bc4ed6860cfb70b0a8a2b097748dc1c85495b9b48. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBPCP1700301.