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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 0x15b48b5b3785d5c7c0546ed02172f934d760fe9a60327e8980fbc9fdb57a852b. 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/0a5a35f2-c848-4254-b032-9d1a8dc2f0d8.json and https://artists.proofprofile.net/proofs/artist/0a5a35f2-c848-4254-b032-9d1a8dc2f0d8.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 0x4f1117080d96f8ad2e532fecdd23b6fec3aadf77d04128993a4b707a6a3e4350. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZTAZ2416306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b78ad09766424f8224e7118ce1ca1444cbe16f4eec8df4e9a88fb12fe4159c. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZTAZ2495327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6084639c3a7476e04a962902882279257ce5a9fa22f81adf1cc1dfbd721d52. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZTB22438310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3470b4700692b5c4488c6df73b9b68063ddb7bab998fff5d56d9cec7fb781b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZTB22454815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38d7332e312a24a86f5b1d610dc9ca478385dcf4113ccd52a8d2bf52a4df6e2. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTB32424715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55f612ea1c8d43a3e7b8b07d6fe7db142c830ce279a4b3724da28c19b28050d. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZTB32499135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280e91acf2996ce2cbff2fdedbdee859d9e1f03f4bf913aba4b2a369869722c9. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZTB42498104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e4c79001768bffa0abc8c5ff7a81cb02dc9a8b2efcd4806a6da07e4e7e19b9. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZTB52455024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4dfcdb7dd53da0f4e68e27938dbf8227ffb1545442737fba7bfc55e446a6e1. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZTB52496048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0d8a13b1dbb31496201c33d5dd07dfda83a3a43c263507820cc404ff2e900c. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZTB72403450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acf5f6c88649cb13bf90ddf270ea2259fe7ad57669a9762700598964f53ba54. 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/QZTB72446663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec286172fa78b38f902ba5da787bbe110ef5ab4b645430112fee48c74fc795f9. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTB72446660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60d2918b27639cdc0b9d8857c2e042d04ea1d76a2ae05c11f7d1ff1b188aeb9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTB72446666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e138f8991762b1bf2363f0919157410a037215bb9c7abab8d4537571c8c2bfd. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTB82412149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b165474d7b2b6692b04a3058ed66fa947c8ef52df7c0e4d16a94839bb317444. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTBC2480687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00216a2de68cd8f6cb18e6437aba6a55461318c045af9ab17b454a05881f47cf. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZTBC2480692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05f8dcfa24335d441aa959212e2bb6c264cbbd5ef5a51c4affe25a94e9fb94b. 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/QZTBC2480690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0191c319c48dfd99b565d6d57eb1593dff4ed3a814d458b306f82a5766b5f3. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZWFE2444890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb404996a9b09f9c68987aa7b31afee785a2ff3e381b0ff19762c616561039791. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFE2446297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a28cb8dfe9597cb4ef01f961d9284a41b7f4b5f93fc79ec0bfe6b7cda2e4dc7. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZWFE2446296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7b039af14c814708998df64e3f2a49db7096109aaaa0a84ea649c02fc499de. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZWFE2444893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x694d06b528f5014dab7fb531ca7b6101d8735825ed5dda3afec0715c7136036d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFE2491842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc6d81bace71fab5c90dc645efd943e34586d928c5dd25e8ae005c1b6ed469e. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZWFX2477485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9d1eb8eb41255b0087d1d627d4833458b8853cd65ec11a74c2ea96a15fa2ba. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZWFX2479155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110de9da8f0a2e79412a25073275c27cb3b2ea5930dccdba1a71e648ba00680c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZZ762424283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe007e9e7f3b0408aeb974bdf42512ecb19e052932806bf4cbd38f3338db2da9e. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZZ762428354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3aebf771b41b83f43fb2b753a927125874354f7cd1e57f6af70e9180646a791. 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/QZZ762420758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0eaad8ed06c3eb3fd1ba3538e4801cd4da19fb0261380c79ac513654e94c97. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZZ762496427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99091fc658c16324c19296dbf396f377d41ed3911acab03e7329260da592c70f. 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/QZZ772430454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529e5b0a2441ab49ded38a6813d4442ca006d8c2f1bf7cc4286a125bc469c577. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ772432473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56cb1d86a28bcbd79cc87a1a24fb2e2dc74e58ae09a6e84c80d5cd6d0659b7fb. 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/QZZ772496960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01db5f3c073c4dfbd3c2892a1089199fd3d9c198ac162f72256f13f482a42a8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ782430126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60309c7ff7767dcfdd1d058986946b75a1cb8e215bca1a805090a0251b2d897. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA52540411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0d289e6a410183e42c567b2993ac567ac97fca5eff6befb82863cacaf6547b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZDA62543454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9b865f890a78f2297b418cf81aba48dae58d8975e4f31f2cdb4ae75a7b4daa. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZDA82596972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64975c32591f64f1294eefe740b235261c609bc9b0c2aa3bb89415c2f5d4cd4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA82596963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b447e048d3220c862e709bed66b447e06c6fa5849cf664c5a4cda09ecb9b6df. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZDA82595558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d473624d47ac26e1a6ba76dc352e9b179bc0ef9d28bf52c569cf817d79b186. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHN62584184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb159faf917da80f8a9615336fa591ee309bb3364083b2da6e92f4e5ed6fc70. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3EY2596784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe326dc13da7f46e5fd4c62c6ffb79518a38429b1b2d88422824a6945336b5502. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT3F92582705.