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 0xf328e63fa8135375ff89b613b7f03c5638c810b2a6ece55e93deb1041f0fb4bf. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0944cc6b-db79-4a70-aa16-667d0dd90363.json and https://artists.proofprofile.net/proofs/artist/0944cc6b-db79-4a70-aa16-667d0dd90363.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xf2c032bba1a2989b554db9a80734d1351e2d002215d273f024a3baa2d12b1742. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NOMPP1402040.
Hindemith: Symphony in B flat I. Moderately fast, with vigor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761d72137d5481d9094e543001b1389b5f1e21147302090eb182c90d780bede2. 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/NOMPP1402050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5685a208841e69a74b56e7cbaede34485a343079a7b18c7a3b91f33dff5c87. 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/NOFMK2001010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66210f1fc3542faac3587a047627625eeb0bc78272fcc3774bbd859b6e91072b. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFMK2001020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a4d7411f88eeceebe36b9e033bb14aafcc163e05e15658aed62d8ae430f922. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NOFMK2001040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784f9f46a23a2840ca8afb9c1e8542e8377e2ea27917ddde85f0bda81c93cc5c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFMK2001100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850ebe5065d5208b235103d51a9670caf9cc19e5de78971db8baef598b564970. 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/NOFMK2001110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c48ff7e8f11c80e3f4ee20ca78a51b5bf3a51ad9892c816a0999bc10685743. 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/NOFMK2001120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed66ec68be9cb052225f9343595aa660f645fa068a314af021d12dbcddc6b16d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NOFMK2001160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f3a21baedcfe2fe5583b9cd7d0b6dbed35c6a649cc28cade995ffaf47abcb7. 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/NOFMK2001180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4b570d252816c3afc6d4464940f62b1f9fa5ed3a336224a68a70acc9c2d3ab. 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/NOFMK2001030.
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 0x5d1724ea430e8f8966c9de02c8379f40858096f02124ddba08e41304874c14b8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NOFMK2001050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2f595edcb2b6eb1ed876c8dae8eccddf7848145084cde800be9739477a4adc. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/NOFMK2001060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0344c7ddc3736b4433db5d316c10435053c57acc185c0269b1a817a70517c4. 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/NOFMK2001070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6476c0d8905934b29f4654024c740bd7205c3d3d2db16fe8ed687919147bf755. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NOFMK2001080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b1a535dcb9996f447904de4c2e48a73f776a1fe6e7e8165b046ee771151b3b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NOFMK2001090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35482b84eea20a34ebdc4ce6116c24eea117b5ed1f7ccc12bca0f95eb2fa487f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NOFMK2001130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27137b30224b66cb6addfb8dfad2804f6b2778640648af67640056f896efc3d2. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NOFMK2001140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4147d5ba3ca2c7fc5380bdfa94a67d86ba0cc99258fc41e86164943856fca56. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NOFMK2001150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7ed68301556791ef0d2f6edc8c96e9b7efc479298e1bde25ca3137cb915c5b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NOFMK2001170.