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 0x921cb4a756a316a4a0a5d89efd80175740d51be1372472ae7fed0ed2504bbc86. 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/7141e183-b461-4dc4-b9ec-100689bd4119.json and https://artists.proofprofile.net/proofs/artist/7141e183-b461-4dc4-b9ec-100689bd4119.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Recomposed: Vivaldi - The Four Seasons: Spring 1
Richter: Recomposed: Vivaldi's Four Seasons
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 0xeac90ad9ff234eebe4c2b604770803c7e10149aebd02fc2af894b413f6bdc82a. 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/NLB152400154 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Spring 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2faa64ab6a71b53ce0d549dddeca26a48aa6e09ad6cac02e2908b1d3a5850f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400156 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Spring 0
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af49178bfb2ba2d778f8b8a37ab59c5cec5fa92e749537919c0e9d93751f6a2. 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/NLB152400153 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Spring 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3d0bbbd7250f7ebbd68072594d04f0802196529139cf2414eca8ef55274447. 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/NLB152400155 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Summer 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb98e0bf671c1f22e4926312a32803482e00e16f3e3df9e4a272db442f91caa. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/NLB152400157 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Summer 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8218e8ce7f37aca0c2dc984c4cde22b8872d14ca599a4023b6479ebe7f5347f4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400159 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Summer 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58161686ce4484838467ea84ffd8c6dfc6adae568f63bdccd70332fcaf1b8c2. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400158 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Autumn 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdce32a1a55739730a6eecbc45134fa24d225b31012843c5e0c303eccf7efdf. 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/NLB152400161 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Autumn 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b96a10b2ce51b88217c5d1d1f5aa545b71ff7c1adc2082a98eafbd04346117. 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/NLB152400163 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Winter 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6cdc46b5380c5e05f08de9dfcfdaa35c8a7be258522d80519fdbe0e9fd651b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400164 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Autumn 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5ef375c30c9d697163409b27f87d03747e99e8a0d93d4b297e58a11d4ef451. 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/NLB152400162 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Winter 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a78636ab1d55b755532f30b490c25e6912a03ddb5688c206080680d7d0d2bb. 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/NLB152400165 — a six-check JSON result.
Recomposed: Vivaldi - The Four Seasons: Winter 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760892d6308c63b9ec91924cc4cb5ff5fb3144fe4e43a3b36ea0733ffa068a71. 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/NLB152400189 — a six-check JSON result.
Violin Concerto “Distant light” (1996/7): Andante I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48570c64bca5f922c302ecbe4a9bbe96ad9b4dd1c3c02c2e91f647767ed6c558. 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/NLB152000398 — a six-check JSON result.
Violin Concerto “Distant light” (1996/7): Cadenza I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1323172aec2bd83c82a9cd5b4e4e840fb04b662f5dfa8d1bab7a8022e27470ab. 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/NLB152000399 — a six-check JSON result.
Violin Concerto “Distant light” (1996/7): Cantabile I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c446d3f8cab743ed1bed594435a19a9fa2aa4d1b3765d3fa0ef8568e965999. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/NLB152000400 — a six-check JSON result.
Violin Concerto “Distant light” (1996/7): Mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4fc1a0740b0263d4ad3cc065db394b2466d5c3f5b497e3c4a93385aac1b88a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152000401 — a six-check JSON result.
Violin Concerto “Distant light” (1996/7): Cadenza II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84687d76a2e7e16da5a77821e408999637066dc2ff4955b4f5e7d982168b8a66. 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/NLB152000421 — a six-check JSON result.
Violin Concerto “Distant light” (1996/7): Cantabile II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac1b7ab0a6b3fd22d82f3ce67cad969cf7296cbfa0db0aef338c62365b733f4. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152000422 — a six-check JSON result.