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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 0xea39706841e7ba683c310438d1f100cb22b0dc2bc193b1a11eb5a029e25afa39. 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/d3e40cf8-b2ae-4406-bf60-58ac8a760e64.json and https://artists.proofprofile.net/proofs/artist/d3e40cf8-b2ae-4406-bf60-58ac8a760e64.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 0x31a281a3a80644fb305ef538e57c7d4aa989f13758d4a797a9b6802508b06085. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/NLAB10600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ca09128b22eb801d6641edbc3022496f6487f0a5432b539a7a5c8c354cad56. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/NLAB10600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8df211e5e50caacda0e698d92e69e191bf2379402b600be09fde12c22b1fb9a. 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/NLAB10600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d9cc016123856b676000eaf1d2edca6e3644ea0d1f5874dc6a574f43ede8ad. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/NLAB11000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2eaca21f5ee8f6aa73af0c8a75bd6d8d91932d2390355ff337253a202f83c5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLAB11000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15d4ff1a9fcc1a1a69b0a40131a88017073cfaba1e5f709257301c5a7b75bf0. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLAB11000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0966d862344779eccd196f7e0318d653abfac288d1ffa224ee304f2c276f2a94. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/NLAB11000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de3996b5f63cbe9d5710cab9c7d3a51b65161060323cd1bba3af9f92ededc7a. 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/NLAB11000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8601476c31a9bcf376389c53bd9c6b3da7e7929b227af5374f61026ec3387b01. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/NLAB11000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1144c9b1020bc75c0f00e9f9c0099f0205d29d34b0782b7601c1f1ce40c818. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLAB11000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d129b25e454b75e2a57dbe41e2b9041d23207acd1460a1b715e807296c24724. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/NLAB11000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d4ad052da5942a45e5c8b4714ef87cf0b8d7fe37bf49555b7c871302e4f3d5. 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/NLAB11000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa109560f9c15aef80d344e80dd8da6330f23ef84d893cde81ddfcb5e86dd9ca4. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/NLAB11700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db760db1120ec673a66797d0cb8339ee9ecf1847502e3038a676019dcd2d42d. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NL4ND2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4e9e666594bee18f597995b75faa9aef8398a7bd899b52c802f8bc8789cee6. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NL4ND2000006.