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 0xcbcde8cc2536753543fcc69100e34ebcdd517245d7a70e28dac2ca6cf1fb1e1c. 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/fb9f65c5-44b1-4a09-a6ce-64565ad7a6e1.json and https://artists.proofprofile.net/proofs/artist/fb9f65c5-44b1-4a09-a6ce-64565ad7a6e1.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 0x8efc6d30cf9c69164198d0fbd52c52b56aad1f62672245896d24bde621355873. 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/UMA864772581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9cdc99072a5adee094e87eaf703ee6a45128ab7690746f1b53e6e637aa726d4. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/UMA864772582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410de02230223c379b12aa2634572d298e52e082301a4cb1ac64fc0f0a37a245. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UMA864772583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ecca7c65128cb9c36b59aaf87d2a11b32c20ef8074032a9a2ace6790f39f8a. 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/UMA864772584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b19a2f53cb4030a17821581c910851864dabdd702ed4dc8b3d3caaba0f4a50. 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/UMA864772585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ccebb999eaca2ce7698019b61690c1557f8e5a90b5a7dc903834ca3d286819. 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/UMA864772588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda45fdd2acc75a7233369f7aa70d80cf6c6de751d4f6d5c8f5c6acc1423046c8. 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/UMA864772589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c1da0b1bcc5c246d5652a16d7114b12053e3e2250cd3206f7d898741671715. 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/UMA864772591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2d54874b91b1e74f8c68efbbe0ca826bc1e063fb53d07033b70ef23b7a55cd. 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/UMA864772592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cc00f9e01865434a94633909553ce0df83dec54b4e75384ef51e7bc136a198. 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/UMA864772596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e65b6548554205f9af6c58345b986feec944a1bf146b54df3c226fb84d1e8ba. 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/UMA864772597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973768dff9cf8909d9a485f83063cc65554341a82ffba0b5dec1a44906771847. 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/UMA864772600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b128bd4e4bdee2894e7c1e1edbd517e65acc491047528c14a86342c1be4f67. 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/UMA864772602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f72883dd9a43a37416868239ae94a6a6139b0e5961e42dc479f2ac237d9dae0. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/UMA864772603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ca35267fd965e06b11ab14ae9e084fb494ec6d841f051fd47bbf009f6e437e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/RUA1D1703584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb899bf07bc99e45d05dc6bc9d68d89ef6f755c0e0d51d482f1338bde01c0c34b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/RUA1D1703583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a85332ceb49272890043f63b8b08151312f33db8523d2affcf283b83dc2fce. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/RUA1D1816403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d31bea7aaa9a2079f48ec32f02ad41db5a33bd6e2cad07ede823c17c3062794. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/RUA1D1816414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c980d70ffbe21f512a39b6f2856af7be7fe8c5cc812ecc92a51bffae72476fa. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/UMA298103210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb516f0ad3128349afb9e5e500c02c7ffe47ad9ac454ee8221d6a3985b198010f. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZW9M2452599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d80a5f406538be48fa6a777784ffcef8f9c88d21bd84499e238c6672e4318e1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/RUA1D2529164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727cb1e496fe00da72f42082e9520abc0da354263f9c47fbf5c10bfe45b7b3bb. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/RUMU12710322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12571bcf7bf8662de3d96227d8e068167ec59dcce30c7aff576483d84883fe22. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/RUMU12710557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818dfc7e734c7412ccc8af4cc0ac5cd715045506e3eb2ba75a4d08777dc34d71. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/RUA1D1709297.