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 0xf2a411acb76e2dff52a2f74aa1ac4234be90c97365832430d3e3ac43047be283. 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/12053257-d870-4588-b74e-5a7f0677f4ab.json and https://artists.proofprofile.net/proofs/artist/12053257-d870-4588-b74e-5a7f0677f4ab.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 0xf4be0108d914a575a6eb8bb38cb46885771ead2b0db09dd49455021181ec422f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE6SA2261025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab13e8be88ec54cc17fe69a7e6f5a8ea357ab7e7250f6ff3ee64efc44d924d2. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/SE6XW2275213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9acf5bb57b95d9d90b4fe6a4f9d54d4d4c7ad23c010667cad88ff4997c2f0c. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/SE5BU2410458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da4392b5e1b3911ee779cd63904d19db0ff48d29c75ed3195c471b9c4959ddf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE6SA2261028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc101a6567e3a3c6d2d42aa0fb6113d08ae905c0f41e3b79df0e1024c278fb8. 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/SE6XW2268475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce64b427b994338959975763ee2834fea9233094f8576004d3e14f9f2f97530. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/SE6XW2275187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f71b5f252a4aaabdb37e913c551d5679446b690422387ea0827ec6ee240f37d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/SE6TI2315410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302d0d2848db2ca19405982ef4ab169b014a406ba93acf0886a690f1e19a31b8. 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/SE6XW2387659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15de44e96d24d6c3dedc7b7eaf19deb7dc7b42324201130b350c564b44b07851. 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/SE6SA2394151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01180ae9130d3106e2c7fa5d936842f1ab269ec9ba66c887e93d04383a7a1292. 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/SE6SA2305466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5046d4a5f1e86d30ef042a7115ccaae32aea6e6030f91621f1a63fd7941ee380. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/SE5BU2333856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689a9301fd2622e55f77f79e4cd9247db52edaf9ad9c789b4ebace724cecaa97. 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/SE5BU2333860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55672247f07afb0288eb1fcea13e1cf91bed711bb292454ca6a2469b46a2657. 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/SE5BU2333863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1edcc8ee056bc6c8577f301097138e1c49f79f2abf21bc94f93850c7cfd79032. 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/QZK6Q2018335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d7f708b2b86da3009766789b5402abdd4a0b937c91a769b2ffa1085af699af. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZK6Q2018331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42c141a8d42479e3b87bdcfb1e3d297a0408ae90542bc00ec93ab9d713798ec. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZK6Q2018336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a44485bc42099397a0cdd70f3fbf3162e9fe2abd9a35976981eae069321cebb. 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/SE6XX2313342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbf23393550713a1c5cc61f98e8fe2d3c951028e0e2d504c976a6e3000ed0e8. 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/SE66N2341494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f99e617127e53b41049814d78b61a9461109beb1504816f5d1fb74fcee5db9. 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/SE5BU2478419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c2754c11d2fab2c237c6f6d180c2cb9c05d7c326f86c3611e766d2f2332feb. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/SE5BU2478420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed97bf631b66fa61386722afc4563c6f43f67c944a85f77627e79d4f28d7959. 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/SE5BU2478424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb9ae9dc05dbefe04c2d59afa53c3bfb5446d1c3540c4e019617fe20ad5fd54. 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/SE6SA2487288.