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 0x730c974e489ad46c096bfdad7eb0e9995e9e037fd0a7a1c25ac9d14a2d130985. 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/1cb0b323-8bac-4877-9838-5235e75a55a6.json and https://artists.proofprofile.net/proofs/artist/1cb0b323-8bac-4877-9838-5235e75a55a6.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 0xdccd76efc8bfa662147042aef7310bb75b774f26d009dfbd0c0a1516a5a520be. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNWR2196208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1488355908132bc8191a11cc2535ecc8a34d45da6e8ac9b6fa041812ca744806. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZTAS2133919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fb2aa334b305a08f0a4a12a30a6f555ba15b9f02a7b8a50e277a95fe633d2e. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZK6H2282867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fb2aa334b305a08f0a4a12a30a6f555ba15b9f02a7b8a50e277a95fe633d2e. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZK6H2282867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18420d87411d5989cde25c9674a970025a3a760ef6e7e5abc2cce6484d1d6efc. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWU2216792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86580bde23d66d616c78cf743007518494ced578efb8d6de71194d46d4ac60fa. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZES92326157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082d3fc779ea61b1fdf1add0bce29c037d2a1cc6c783a7f80736372e3a7e2773. 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/QZHNB2394218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082d3fc779ea61b1fdf1add0bce29c037d2a1cc6c783a7f80736372e3a7e2773. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHNB2394218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdca4792ee06211fdfb8e8f64ea0ff6624ac49c32376a89cfedfa1a7576d597. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZNWZ2354215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb185584293d724970e5d6b2163899c39c764bb8f428588c412f7bc953bde13b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTAX2301375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7181628745768c361ca9fb4b0ddf7c1bade97f7861b58dda4855ef15dc2be33. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTB62393036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7181628745768c361ca9fb4b0ddf7c1bade97f7861b58dda4855ef15dc2be33. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTB62393036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2ecb3b728818b3f9d7f4e4d1bb97b3cc462c97fdb128efbff7df0027482345. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZFZ22425537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeaaaea0ea0cc15584dbf1932f01effa6f771805cd23370c616b9205ea43498d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTAS2492683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeaaaea0ea0cc15584dbf1932f01effa6f771805cd23370c616b9205ea43498d. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTAS2492683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797246e5b368f8a0ed94f53ec674ee425404942325e5d91af30013af79f141e0. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZWFJ2490947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797246e5b368f8a0ed94f53ec674ee425404942325e5d91af30013af79f141e0. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZWFJ2490947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310488a338adc5685a29f7dd3177e4be830c2e1380a8222062596ebb9982728a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZHN32551206.