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 0x5c87c21fb2ed768a9c5a873ed073e83ead1c8df36a4e1f860cb44d26872e0746. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7b8756f-f92a-4fae-ac88-455825e81883.json and https://artists.proofprofile.net/proofs/artist/d7b8756f-f92a-4fae-ac88-455825e81883.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 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 0x0458237251923d24446e006d362b04bed54add1cda9d229dfec9148062d28a83. 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/QM7281943755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2961d307f31798cc73456f05cf8d04ce6b191814f96d2ee34b73897f28c053. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM7281943601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440877b4274c96b9f5305be1a62e619008de004547317f7fcaea389481460f0a. 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/MXD782402036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8520d9e085c8509ed3a6cce9b73f19f8d1667e4979accc750b09057811feeb5c. 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/MXD782402035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d58fec22864b448b8dab9079d3275110551a23e3c41d3bd0f8f9b884334ff8. 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/MXD782402037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd416fb8ab65eb93b3a0f3e787fe90dbe2c2334c34b0cd70a887333543776330d. 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/QZ5FN2260348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e3845053c0f2a30b6d21db25e2251a90e229ac33feb5aaeff8f2559a678f59. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM7282068066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3659c2e149227d94ec5ec0da2f09f113caadf03e8857a56569d5aa8e33df3f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES35G1200567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bb7bf31d2f466b041c4f9b032a446a78022ee0823aa99770f668a72535c72f. 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/ES35G1200568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544ec75dd3f3e523ab535679d1176ea422a0c7bcdf9083b1aeccb1594597986a. 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/QM6P41890083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae954f9e39ff83fb2d8b1b7e35fee4cb34d85af3b41644f50c46447716a9e594. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CA5KR1563518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c87b8b056e19a92f8b768d8a75ae220dc978c83d1def4bb4cc463044f829a2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBWUL2450285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc77eb5b99880d815dfbb886e32638f117cde2aae02a78731a574b5938b1319. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/GBWUL2450287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e6fd8fcd666abe005f8344d24d2205d41a5ec969d1c6b6f68d2dcd24d7de03. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/GBWUL2450293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41df4e82f7e93d0972867f980caa7c213426738c3a605e7aee712c895580548b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBWUL2450359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19e0135356d519a2f83ca2560bd97af1534d72154d2e6475c0930a2ff3715f1. 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/GBWUL2450316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67956b33c0a305ffbfa2cdc7aae84c6e9c9b463ee1dc76b53196ad7a1f59353. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBWUL2450365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9c7a9dd99586743e6fc0dd46eba1fa4202a2fa4729057b2015d79d3ff69e8d. 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/GBWUL2450346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8a7aaf87bcc5141561c4ff3ef9a08757a89bff8fe7bd2e5b63bc7ca674a5a0. 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/QM6P41849329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68d06abbada5a0d6588904eaae78b6932ae09bd1fd3272d878f45448f0d0b55. 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/MX3742100606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c03548de321baa0c0ad6cdb1df6777f955a6b5f69f66ba1f74fbf15e06eab9. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/MX3742100609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850b2be689604faf8a93ca99a7e48b58450c1ac6ad5181d8969b205b3313e3e2. 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/QZ5FN2213034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fa5e87a48a73c719fb64ecc519248dcdfc6e92133fa7811debcaf026ad5066. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBWUL2187466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2cfcfdd6f428f46cda4379c6146e53895db49124ba8217ed6f8a6fdcebdea7. 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/QMBZ92056046.