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 0x289134c6de05c5ded41fc377657b142b8e9b8d31337a53049560afccd4aee4cc. 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/827a67e5-5797-42fd-bda6-6064c6f98192.json and https://artists.proofprofile.net/proofs/artist/827a67e5-5797-42fd-bda6-6064c6f98192.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 0x8f064c6b99dae0cea56f18944534f21c409d4287d31c681d2492cb5cbb8cc82d. 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/QZNWQ2450144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e1ef1d1928a236a571c714c526929476b98373dac49c79048ec02bdff5bee8. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GXD7V2299799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf3bf5cfc576dc59abcfefb3919277eee449e726e1a8b20e3a813b59cecc001. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BC9MG2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80fc2bc2ea2d7eb220a26160e33c7e457a1a3ffff6c907d0a5c6380e6ec394aa. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BKGMM2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3643c3d08aefaec1e74643207ef59e3247383595ba0791d5946a4fc7b0fe23d6. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/BX2VC2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8801e50f1a967d573785724ead1d451ddbbcab11e9cbe2c517841114f9698d13. 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/BXGPX2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08c61c0c9739c641a75c1b21347bb2ff09f8a22ce1d7da607761ae67a8058ef. 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/QT37S2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb506bbd387da92ee3f530b834f326b441017fbe022f96d1fb5d18b903c6973d4. 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/BXH552400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f443e80536885f24b4bbbf78f5c4eb9d88d19f3669d29d12861132267d9b559. 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/BKNKT2402691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce152fdbff6dab9e6d0d0c959bc3e589a7e0c1fbc1e88cec82547e77e2e2fe9d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BXKY92400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0accdbab6f78ec7311b621555bd8c3a577b83b5be3bf35fce1a260caf80688c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BCFCV2400599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0e13c5bedb667ac72bf761fa7964cd88c0100425df7b23462ab220b6ac6b0e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BCM9B2400919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0543b27c5229c85822fb8068f515fce646b8f2ba590c6a5bbb8b2351765696bb. 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/BCFCV2400511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c68abb608b416f9e53475416e503be49238dfe358d7e0d5c20d7350a23775d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZ5AB1931618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8537cb73844e07e7c368f8d20d016ffaa2b5565e27fb3b5cc8a535d0a6c3c3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US7VG2495210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e2c3a59178bb70f2ac8b6f7dcef68d479bc71a74d5f7df480278511d14192e. 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/BC9MG2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c067ca216b36875fe50a47a03e656d5ccbb083a511b0717514000c5cb8b7fe7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXW0K2100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7855f2bfa06c33f2ad9619034ede66fd51f99e2921334da81781262ba19bceef. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/BXQQG2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb959b4ac498684cbd299be8e9d247907eb8b8b0dd96e8399e75941630f87a5. 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/BXLNL2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc527c87aa6ede3e37177be20ea2d35cf5e0d2b6b10c027c704c60eaf9a500a94. 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/QZTVM2422212.