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 0x8e1e68d23051f8c5b8f9a49aea12138989bc35fc5db5aef038c0a1b6fa3b1e38. 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/d84bd445-bb55-4eee-bb3f-6ac69c1de32e.json and https://artists.proofprofile.net/proofs/artist/d84bd445-bb55-4eee-bb3f-6ac69c1de32e.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 0x52ea7f01de1b5493634e9b91ff41ecf256552efe379eddc490d438197d9f4f07. 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/DEWU61900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd580b1e6799c65522a28c44c382f8ed8207e908f2694a4568561f1d800bf0021. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEWU61900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255ca550778e5619d2c227e2722df3d92eee9e2a4101a42c3028ad363ddd75b5. 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/DGA052028922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21c1547510bc01729a9a9821021f106b3ed2afdb6a91f1645c3103a62087053. 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/FR96X2100648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fae70ad9e7dd9f2bd5dea1b29aaad09511c699a7870042a937c122cccc152f. 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/DGA072166581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6301a45bbd8705a4da623e4ed39460180089275ce4f196482e062f4c31d287d4. 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/FRX872183020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9b92f50f21c55ccd7c93e417625a1281ee5326aa473812899ac240a0f4268b. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/FRX762234690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c25d9b9521c5533e3a42f57dc901aa0af7a0263d703b2967ac1487b95403d70. 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/DGA072240907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65033711e966598f99874533a01cb37f8d43b9f688c8b1b8a3e4597818c05ce. 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/FRX762306534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7b0c7d58c54884a5123c7ed4904e65680e3665a044622dc32567170b31f7b3. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/DGA072365806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb589d2c0cf404f1b47bbab8dded4d4f5309c13390557bb246fe5b18001efd733. 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/FR59R2468531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b371277c89d807f0fd5dcd2798fdb45cb96cf58e6d4cd06ab2aa21c33ed1b6a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN062300830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9865c2e8f27fa377af34add4e0aa6329600a21715d6e7cf4a1c13bd4b78084. 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/DEQ322100347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1794761d0ecc106c1d3d647c1069fd214a3e3fb605fd106ac3df575f1768e4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEUM72406915.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccfd96c18dfd4ff4f6aa607f9fca4cbbcf3440c046447284451764dd3b28aba. 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/DEA622303191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccfd96c18dfd4ff4f6aa607f9fca4cbbcf3440c046447284451764dd3b28aba. 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/DEA622303191.