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 0xa7563d4867992a07f1b2b0b5d01b0928244157e4cfae7df791f8d9af8a707412. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3f519a1-f13d-46e7-949a-755edbee102f.json and https://artists.proofprofile.net/proofs/artist/d3f519a1-f13d-46e7-949a-755edbee102f.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 0x66c3954b77a0fd9ca2434ab5344e16da4dab7c0a29af7d533b4140fb09c0c35d. 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/USX9P0638457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ab5225b20075854d1d7311ee3d695872ea9ea2b25b352d59082ba7a0230b6e. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USHM80734880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709ba0620a625c971c52770354cfa67164983cd75bfe86cfd812034c9cbf1592. 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/USHM80734881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52503ecd7463a1b1d5a02653bb417754c316ead0e8e1dc7b9d6f344d033a783d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM80734890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf9f6f6be5a9c76756b7ddb2d51ed40ebbb5f9831a3a54da09ad5aa7b1ce76f. 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/USCGH1554399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a74bdc1eb2e55d08b40184af46061b25883fd01d249400b8c6a01b59cb2e88. 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/USCGH1554400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddb91bfddc65a4350492a2d6c43ccebe53ee0188da935936b72c16e5a246554. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USCGH1554408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbce19e5ad81a64c1266bffeacb2e22ad3b810d57eeb3438a51b22ed22d901b. 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/USCGJ1790421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b08963bc1c309d5f57bc935e393f7258d23f734c6eeb7f1c281721557d4af0. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZ5FN2228679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffda097e07ed215549e7dc06bafd87b60163eb7087438d1eefc24329972a4e2f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/GBWUL2241418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf422b65a58c25c03fd90a4127d6aef0919a08d80af9c5bfa4cb6eb514bb331bb. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/GBRKQ2303744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75128334917590a3267b5a9616c3526dc5f3ea5bf093d5ba0a503e4e8ca53cf. 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/QZ5FN2484088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a868987df6242c9d8a582a2b309f07d14e42cc4983b95575a346b35ef55256b. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZ5FN2484093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d322c46cd0492bbc990ca683381e73be867574aa518534d7a1a3b9e182136f. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/US7SF1756415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6a30f48834e3a77700035da0c01fef7fe0fa94cc7818fe5d4c09943f136e3b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHMP2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6a30f48834e3a77700035da0c01fef7fe0fa94cc7818fe5d4c09943f136e3b. 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/QZHMP2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bc78a57bc01e3ee8577aadbfbfef503c43948aef3620009d289ff90c9eeebd. 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/USCGJ2062861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbefe37dceca2f7430a2ed2e95950dbd44fc06508d7d803dfe80efea222fe62db. 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/QZTV32376964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897320b504db23194d290aea89a264cd06fce8c780908818e32b731b394feae1. 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/USCGJ2291993.