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 0xab5120ef0ddae600d1e08caa680dc51931a2563c18783c6f1504c7e1909239fb. 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/ca8dc669-27ee-4bef-bc40-e79d4f15312b.json and https://artists.proofprofile.net/proofs/artist/ca8dc669-27ee-4bef-bc40-e79d4f15312b.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 0xd3984218affb879f49105e3706c5566ca22bd2716058750c7dacce29dcfc1e3b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GBSMU5773330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696c5d24708edf64e9c5a96549848e563afbd59aefa104963b77c3aa2e472fcc. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/UKT6B2200550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3f5abb69f08aa1fff3e3a092e7c62a29946cdc2cf0ca9ab161c58318641264. 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/UKT6B2300062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e91f3192f67c4c1600c2899339c5aa388065cf488556c66c37500e3e24fa455. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/GB8KE2320442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e0be241b3a124da116ab88699dc627a5424f63a42aac966a62bcefc25047a5. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/GB8KE2320704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f34cfe2e8adf83dd49c020eb705eb197c0465f85bf02d964191cd3329c9c4d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GB8KE2401790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ca3d9f61f028c6d5e5a9271471a811b37ca80c5b7e9a64c0db023a7bc4087f. 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/GB8KE2408488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d10c73979d2a4eb283461a6489cc72ea29a954ea8f0d9b0699f9d0eb96b93b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GB8KE2408489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7820aa667d24dd39eed19cd167df2279077394ab42226003b795533b5387b31a. Chain 2 (Bitcoin): anchored in block 957868 (2026-07-13T14:56:55Z), 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/UKT6B2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1ed0cd6e11898c8028caf8f963199fd3b6b6926dfd47bf2da25d4eff4315d2. 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/UKT6B2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7871bbac7b7510a36bdd58639c0fbfe1ce70239eebe7cb8db03cc3111415b16. 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/GB8KE2401917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a830c880977f035437874969cc5d46465e47897259d36de4a2e3c6901033176. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/UKT6B2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae98fed04acd0104e043c1d106f8b141cdde9d4ee9a60539b9e30fb3251a9fb. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/UKT6B2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84288252fcf1f72c38092654d7c545e38a3c4ee995f641da0c9e7e0610249d6f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/AU8N02100035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0974fd4dd6e518582dd20b590fc504668e6c2cb950a77faef5cbce900fcb8613. 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/GB8KE2401919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57baeb3e6c709efaa88f04a3d88efd1e6b90d45c91cb0fb9ef356b5d80c50c79. 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/GB8KE2401920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc548422f4d032d509613da1624159c9777f08ca56d36edbddd40d2eebf74aec4. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/UKT6B2300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c84ffe98cc44fe0c6116a84e76df0e50e3483d315273ccefd2909749ab9778. 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/UKT6B2300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec22179abd79990ab0967216586c18545cdbe0dd0066877ae838c1f30ff2a42f. 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/GBSMU5601467.