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 0x94dcf612e1ca174079fb4a311d6884c4d498b0825943c850eb0747a9f8589504. 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/8fcf4aac-a4d5-4409-9cd0-203352a1be6e.json and https://artists.proofprofile.net/proofs/artist/8fcf4aac-a4d5-4409-9cd0-203352a1be6e.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 0x0a42f41e1571ab0d901f15762fb62a79f009ced4dbbb946991c8debc1f34de33. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCAHO2365061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ea71cdebbcc5bdcd6b32be4675f164da47c11fb779a4c5d01995743584355e. 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/TCAHO2365072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706601b1dc4e62427932fdb910b9fa0a18e3e29261c2e9c4853ecbeb2286c4d3. 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/TCAHO2365079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f5142a5f10d2abe7c4b26d654c78d1ef1edaa8d3c979b39234a94b3ab9091d. 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/DEUE12594374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310f20e40651fe650d09d1a99b759c0ab7558e8061a8810b5887bbb651b03eb9. 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/DEUE12594375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712eae0cd90c461843ad3dc46cee6da8b439709138e23b4765595b834bde9bf0. 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/DEUE12594376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a97b0463aa8a8b17509f19a79147fd5d2e500c16be5074ff611cc9d91f6a4e0. 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/DEUE12594377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafaeadaf09587b9bb60f86bdcf5104c3198f153668cb2b15a5fc041176f18e8. 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/DEUE12594378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bfce4104aab6bb1ac803f7ab4e56e0bf2921873685a20be7952bdad2609625. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/DEUE12594379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74807513e354aa933d8691835d62d9aa3a5f8dbd6e68fe73d7cf9dc29f710ce2. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEUE12594380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b881cc1d2c8bb73820866174cb99baccf5390a1f8f59911c87a3db78e73f55. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEUE12594381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd6faf0428c788e8719576d46f5c9520d859d5326ad6eb5c140ee9b6f88dfef. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEUE12594382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3948882a3521df379df8c9f46b69423deb4bcb657e16416917e934db0218f28d. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/DEUE12594383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68f134b487e1c183a697ea6925c4dd9715fe16d7d09671f9ece35dd7145f59a. 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/DEUE12594384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0780555fe18c4ef447fe4e987afbe74dccbc8d3bf86fe5fec81a0f1e9d301b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEUE12594385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225cbfecaacb327fcbab8f5f10ca00180f32aaff0b65809f24b5472aadbb89d4. 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/DEUE12594386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4b4e39509dbb990b760b5729fc997f7bb825cbd15c6549fc54386de957148f. 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/DEUE12594387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb6f8ab260ca017c453b1b1b41d46ae893c6643c115c66c2ae085ed8aaf6421. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEUE12594388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9cbd4f9c6ebf23a25a63de4f6e45c0136e71297fe74e479862a67a0058e6f01. 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/DEUE12594389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f518c5c8a7a8d1377f018c50bdb62a7cdbd64de06d7508da1ca3c751e1d386. 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/DEUE12594390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0b07cd7f431bb3cf598f9c58df42667a0ade95dcb7f0b344daaac789246d64. 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/DEUE12594391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93689195087a98adb048887f582fe6389125c6fd1d18d7dbd75ccbcee821e7de. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/DEUE12594392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74755aa43ec5d7f80ccc979f70156fdd5b6210096a64b2fbb2044cc2bc836004. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/DEUE12594393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a0cf4fa9d47fb7f5a37673dc38327d68716b46c3982663da01a153b1755388e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/SE6XX2527387.