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 0xc8acb6a0bb12a810cf834b90247ff169302ed66a362e79a17d7e5bb41455ba17. 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/d3f8283c-e704-4687-a53f-a579c61261e1.json and https://artists.proofprofile.net/proofs/artist/d3f8283c-e704-4687-a53f-a579c61261e1.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 0x6ec6a13f54d6087c9f7820f6118cd72b2a5c3291c53985f169ddbc1623b0116b. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/UAKK11700100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3677abc41ae36411105e39345fb11f70165005397e182d05fbcba2eb7a1a955. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/UAKK11800097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0b75b0f7646fbce0004df18ab8f6a91fb0dfb484ad989c53b8dbde90e3ea0d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UAKK11800098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7129ff5bc22dffa3ecf90c1d23b696733c44da167b7df254b282e6d0b33833e0. 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/UAKK11800100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e3a07e2d0389b55d1a244f9df68085e0d026e08aef1e9292698798005832d8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UAKK11800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6340cfcf1241756d7a80aad217e710c48cb20b8a0abc0b1802b733a02da4d5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UAKK11800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533565b4a90bfe43be8c3e88ac7942a636a9bd7ef5348e234e1e1c7b51fe7659. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/UAKK11800103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc922408b0712529dea37a1e45065a5bcb66fd4c5c41a19f71e912e4bb1a3b863. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/UAKK11800104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248c9fd4f7e4cb295d2b884c382287f48994ed1eb4f20f3fea7cabd500310d6d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UAKK11900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2452199d9bb266b224340a691744261de0bb049ec95ad02d8405b510f546bffc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UAKK11900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6f8d11d4465611158e3772163a93d854a129c442593606af4350c855fca156. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UAKK11900032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e22332df0786178a94ddf3769c4b7663885544b67d695e13c4680c58bba9d3. 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/UAKK11900033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8ff1a07f9d15402d859a793a554e7869b823cf9ad2f3c81fecd9ab64cf1d2d. 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/UAKK11900034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde43a493d78d77c402fec4215821ff299b30ee643616ace3107be3b625b79af6. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UAKK11900035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c3a3b3c2378247d0fcf768c9810002670f6bb928e4ac0786b2de7d759302a6. 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/UAKK11900036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf7b9265214f439dd91b93a51ce1aa8269057497126b978663da4d24eaebdfe. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/GBCLQ2200615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f70c02e81faea738a3258fa84acea301d3cc423b4b50e20ea5ffde647dd3bb. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/GBCLQ2200619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafebbbd5cf9c71024ffd9e486314eb9a1ab183ce503c501e6f2ef5809dedfda3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBCLQ2201119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d4afca12347a427dd6eaf3a3f97392bd034f309624779ca4a8ca6eda5814db. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GBCLQ2201122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250307e602bba11fec240e621e5cc3e9577100a910c11a0eecfaaebbad8283c5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GBCLQ2201124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06c3cfaea8871c996790b35e0dd860fb69d7b926fec3e2fbb4947e9f9970365. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBCLQ2201125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4423034e10bdfc1d2d646cedef4a0517e91950ad1b48f6eef827cc411be87fc7. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/GBCLQ2201126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffc194c597623e10034f384e5734cbc42d486191789ed2fb56b215000c07d93. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/GBCLQ2201128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808a77ce57b11a06323f2ae73faee2d3b5ccbed66898363da95dc7f0c9de4daa. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/GBCLQ2201129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf115aeaee7564c677dda269d6fc5f21765c14f1ce98260b0afa8d77ec7c0d7ce. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBCLQ2201398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf4432192503309b28ad13012db702b97d57c489b32af0d4e0c1dc86bb5a1e2. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/RUUM72000757.