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 0x35be0e420201d809e9ff177fedf88440bf31b36d3a99a01000df4993196c13d4. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71538f56-8dc7-48b1-8fc2-c2a6bf4668d2.json and https://artists.proofprofile.net/proofs/artist/71538f56-8dc7-48b1-8fc2-c2a6bf4668d2.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 0x41c2a773c0be40bd2caa6f9e5769e0f4b06551291340c1eef0ff2c651302fb70. 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/ES71G1618991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39b5f1dc05b2e6a242a06b15d0c5fd4b9f7c990c1d48c6b3ea2b4bdb1c3d026. 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/ES71G1618992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8c353b1e6b07b691ec6335af8a26e393148e596cabee8dfabe5dc16a59ec3f. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/ES71G1618993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4badcb9058ba9be6ff9b3cb7518c413e3c4ffdb41cb2da63c6dda455a5cc39ff. 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/ES71G1618994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb25cd4bdd61d26de2a4a109f80cd74d0ec263138551b175201bddf3d200f74. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES71G1618995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8497acd565dbf1240efa610328737266c522a23c278f39e58ee32b3a605f0f5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES71G1618996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05116edbacaf88fbc9f935a0b700434a525090807e08b1b0ad8cca800a07783f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G1618997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342b44ec8cbc4bb7dc755b85917112d69b2ab8d9ce0c0cf34de1a6a0b7137633. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES71G1618998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bea03b8057130a378c2882751d3ab52cbb7a63976e63254887cd58b5d9f3c4. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/ES71G1618999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7d5234585edfe18095bbb1a07ec82b90f113366fa8f1110f3c5768cc2f22d9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES71G1619000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d3622ebf17445d94129ed31e43102e6043e2d8aa5df173df22e3e108e04695. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES71G1619001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf201d40de11982aea954856a2e066310a8d41fbf4f94fb7804b2aad31c8cdd3. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES71G1619002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2590b1bac051e7c30a0269cbf8c46cd3d0b04c6047942af7a48fc2f4b91a4b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEUD91892702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794a1a8c276a3f175f0ad573f130b2b9306caea171e1bc753cc248d3520a8fc3. 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/ES79A2017012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed996f64a5f8bf47dbf5dbcf75625b159b87539f24e06a23c4d757154157c51a. 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/ES71G1878597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1333abc2bc1c4e5fbecc57bca42baa8128afdd07bb82d00632c2efe5e99dc52b. 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/USA560839858.