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 0x69c4d1705c59ef366862e0b986c9d291e35b28dbc88f47cb71bc1b18286052f0. 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/efd2b9c4-69b7-48fa-9826-4da0082d9f02.json and https://artists.proofprofile.net/proofs/artist/efd2b9c4-69b7-48fa-9826-4da0082d9f02.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 0x1d903da08cc9e2e5fb90b89da85eed5f77ba67473b8b4affedb13ff840b2cc3d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAGX2355816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf0e2fc16e5eeaa260e4e7f9512163073fa20a2ccb8651405dce763bbcf6b3a. 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/TCAGZ2302802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1252694d33e54c0d721a6a36418316c2a786e7a179d02767216da027df8ad6c1. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCAGZ2301834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d903da08cc9e2e5fb90b89da85eed5f77ba67473b8b4affedb13ff840b2cc3d. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TCAGX2355816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d906d35fbd731967bb4d7707444c2e40ae640ba360192aed0f12b47a662d102. 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/TCAGZ2302058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8772c0477f5e41ab141958b2d3bc05cfec197adae3f704b755e373bf3f790c0d. 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/TCAGZ2302755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf0e2fc16e5eeaa260e4e7f9512163073fa20a2ccb8651405dce763bbcf6b3a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAGZ2302802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6ff2aa7fce90c266a692de4181208a601b48e52a14667e01af5812a6ecddeb. 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/TCAGZ2302993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b7fdc7bec668778044a939eb297da10591092229d90d42f52523254e852d91. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAGZ2303045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c2669beb423f89e8b4775fc54c1d85d56db71eed1f1f6d7788b09abfd550bf. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAGZ2303078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbb341c9cf5e8da98a4c2565ea5c3f3687d080ad959dd06256045654081c206. 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/TCAHM2351921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2466fa520f502909d8583c2d7e7acdc913f96bdd4bf3fa165a411f098ac4adb1. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCAHR2395051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41198c394343de9e406adb91a27bed96175e24ad10b073cdc131e162f9e47122. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TCAHS2310262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5627273f1ab1cec6b2d99e0364dd8d10530952768614cc23eb798f43ccbf8e6. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCAHX2454903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cbd60a1231a4e33f6e8d7ecbc1bbb34e2357fed769237f2c3b95af05658b05. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAII2471332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cbd60a1231a4e33f6e8d7ecbc1bbb34e2357fed769237f2c3b95af05658b05. 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/TCAII2471332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6b204110cf6986f666a4425eff6a2cccdf4896893d2abd6f71d7827449508c. 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/QZWFG2570720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea19980acd093dd19bbbad9a81306ed62092a019ce5dd8a50b95ac7efc9d8014. 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/QZWFG2570719.