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 0x400068d643daf490ff22aa85be837a2ab0e2b6b48e6a806b90778096576d39d4. 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/5e73425a-4cc6-414b-8161-62865d927307.json and https://artists.proofprofile.net/proofs/artist/5e73425a-4cc6-414b-8161-62865d927307.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 0x9dc3c52762531de6ee3397887bc82b362b25d60003cef09f1bda61a20679fa5d. 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/QZS632162096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbaae3667a15af073e743119c0d6934f66ef111cdd9eba507f7850a6820f05a. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZS672111034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69dbd148cb840de82db0f929a4731c9cf6b5e4bf00a99ffac571c77ac086b98. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZDA82068114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f3083d18c4984d9c13f65c0de0556c8cf774d0c28794fe7203c1f55096403f. 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/QZDA82068108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10893ea87fb7d21506c410e9c7205f8571d48a260599c41345f05a669626e68. 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/QZDA82068128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87d919692927bb5a0ec6faca7e9c6509a2d3f0898e0fe232cc4c6ecd27d4971. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:25:22Z), 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/QZDA82068126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7313c1c578fdb5abd97bd26d11637d01f7a6a7eefcbcce0a8d5d221c435462d6. 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/QZDA82068124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd2a7ea0654aec9425a59ba5b88cb16faeec0e317e6a294c6077c1a72f133b0. 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/QZDA82097858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff068c05f5876af06ae0ab06f7e25a115f30f0c045382d7152877e028ef7ba92. 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/QZDA82068107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bedc0d364a17b3f1f6568c0d6c9545b5c906c20bb499c2eea7232c3c27cc76b. 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/QZMHN2089383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5a779aa358bdf1ca8e347adfae46ba50a81b650b3d1c9601bfca94402b55d1. 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/QZMHP2084196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97835832d7362e676bf0e6ccfecdcb38e118437a3d2689ff5d4a5085aaaff752. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:05:48Z), 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/QZMHP2050624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1d6b4a82408a57e706f00c96db32a0ef1ac3127e149df385a85282697796f8. 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/QM42K2132487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ad4522d5d79fba017f60748716ff4598ac0a0f8aee527d3df0cf02ae2abe6b. 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/QZS652177761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a88df94dd07e42797bc179088111fc5c90e680559dee65e089881cb063bf4db. 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/QZS672176910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda7cf05dbe8ad70cde3fd9c7b8788d70b69c269cc00e75aefaec13b1896cfdd. 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/QZS672149615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a496628d23ce03b6599d2b4f3b8778cec1f9911c085b9a03d173aed07604a44. 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/QM42K2134830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90dc4a2586dfa13fb6998c2b8a2e9853fccbe6779b27b64a7f22f30ea916e50d. 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/QZMHL2055488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aefafb8ffca0e3cf1a30ebab997774bb7b14fcafbfc9c484636a277c141adde. 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/QZS662142793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be09ddbde23dfdcaef1c4249b56e761cf044b3c28f4c51e2c727c6637b72f3b. 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/QZS662173296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57e84de80e149c5b75195975b4b4c6fe3c5bb5ed75de903a0ea8f5b91c16214. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZS652105578.