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 0x7808b1300623354f6015eb8197492f257fedee2aae22f5e40db1fd659d6fb2d4. 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/afba0b36-fc20-403e-94cf-e42c657ba1af.json and https://artists.proofprofile.net/proofs/artist/afba0b36-fc20-403e-94cf-e42c657ba1af.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 0xac16e543818d56d52c983f867583e526a5b1c9c003576a1e76e6efdb6d0f1af1. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/QZMWW2429423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1eb822a342eaa5777a29862dea3035192d0e21e093fd84f83da72be91154d5. 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/QZMWW2429425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc67f4669857f23623db812b3dbfa081031f98914d3d2ba3c25b9fcdc4ba331. 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/CBF8B2419886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb414f2b5cb50d61e52ec091f31f061b156bb538ce47ce2ae258dd9c99865edc4. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CBF8B2419150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf0d0237290b676ca8c0e435c7f7530cee77cfc59e7e916f67fea81c292e526. 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/CBF8B2419967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90efe8f6adfa70cf245031e2a3e526428b57bfdcf3496bc51a2c6567f50b86ea. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/CBF8B2419111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb635435bf9af7ec09ed3a10d4d8fd2a2ee12f93d01c9228d30e54d44831742b5. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CBF8B2419110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7e962d1fb454d8c6f5990e42b7f001b4e1069b0b85f3e7012cc4aac79f744c. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/CBF8B2419186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271627454002fb86989b8c3c535a20b64998bac80ca5727efdc8f727120c9191. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CBF8B2419191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61db826386016eecea3d7e65216836db290443f6307f73d51070ff8a8f278259. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CBF8B2419189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c8b6b1dd8657a0144e1e4f5961ac9f7ee138d1cec08ee3b8255e6bbeccef5e. 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/CAHQJ2531896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1497493a0ae50646aaf9a8b2bb0866a7c40887d7c5b02cdc82860cdf0ff9e294. 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/CAHQJ2547791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff104c37e9db3a5eca9384e48b06493adee965b89a1282acdc02e9b4bccc42c7. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/CBF8B2420063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa771610e8c613d0511d2f478d3ed34a6265c02c16fa1455f34f8b102537a7b. 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/NL9KR2437000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc172b37f6820d4c78063070814807157ba9b9045dbcafd634ccb0aadcd4ef73c. 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/NL9KR2437004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b575a825742b97198ab08dc4556452f27a975d77020bce9de12d0da6042d053. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QMAT32384497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb88b075f250aaef232af2019a07f55c69e7b9625d360c3ab518dea131340a88. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QMAT32384498.