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 0xf791f8f16d4de001f3346579bbc642438578406466ce2ea0164eabb46f6bd43a. 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/d934a9f7-a097-4a21-ad32-cf6ffedfaa4f.json and https://artists.proofprofile.net/proofs/artist/d934a9f7-a097-4a21-ad32-cf6ffedfaa4f.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 0x0621d7edc985bc78dbb6ee9d74fdf9c9bc627fb8b4bdf72b3784bd8a10a1fd5f. 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/QZHN82485447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0700a65cb608384b59a876ae87d4eb979a95b4ac846caa67b6291b169bae4d74. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHN82485448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b3d6dd2a1b1c4fccbc8f3eb5ce4445abff865c71693ed04b6c8df9dc27365a. 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/QZHN82485449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77395886b2ecd01f76ade231228828525642ab21705faefdc1ee870b515efeb6. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZHN82485450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4ce1120d89103f8797753c825960ee75cd528590401050ed2a1c0cbac7cb7f. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZHN82485452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2eeba9874ab6e050a560c3a068e7a0f5a5d9cfdf422e246a648bf060315c5b3. 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/QZHN82485458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ceb7c0926837d07b6f78cb33013c44262b6437430bd8b8b4f2ed823fe1121d7. 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/QZHN82485460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1cacb75d8de31c8a79552ca03f90e3a9e335afe010f215e316ae595d07afae. 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/QZK6Q2377957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11adae82d6bc68cb676cc105d3a922c818914ba1b0bcef8ccccb00f01fde5c18. 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/QZK6Q2377960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ccdab2013f003ecee27ebb6417f8c48d329f369549f9febe02cd5f0cd91648. 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/QZK6Q2377962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2faf69944d49948889d3239700d36bb0e7de0007cf018cc421c6901f8ca583. 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/QZK6Q2377970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1844b1a07161733a603de90514c60a75a19b795fa8701b424b223a825d45a5a2. 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/QZK6Q2377973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe504a14a44abd232050388725e68b96de02e4e2ea967acf14670609c9f62dc27. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTAW2203214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034314be36be019b2d8b8e08e1e89d39697ae4583e8256af2757093410e91181. 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/QZTAW2203216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90406d02a9e86abde497e76d6ee46fe38ac33e426f354e7b04b582e8b9e65d8. 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/QZTAW2203218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab62c5cfd78c86b12f22f9cac0a805406f8a953d70a438b9de2606ab34cc7344. 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/QZTAW2203220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708b28478b19b6dd83f0f7bd80e28dd99797a59353936dfe0fc46ee7e44a6480. 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/QZTAW2203225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8dbb2fde07d6137da2809a96cef3286c0bc0f3cc7d2047c8d823e2082e0d31e. 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/QZTAW2203229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60a2edd8953541394a3762cc76148f2e3a69912a03af422ff1737bb92cb0cbd. 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/QZNWR2286981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f33cba770ec37137708f973c5da49f38ed51a8ee4e9c144457763a41f223c02. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:56:11Z), 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/QZK6M2021724.