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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 0xc73a50feef9e3fd9fa7dfb2ed295dd620b3cc224b863f4ebeb187a46fb59af8e. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb0c7356-a794-4be8-89e6-851ff4632cca.json and https://artists.proofprofile.net/proofs/artist/cb0c7356-a794-4be8-89e6-851ff4632cca.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 0xb1783f49dc7774c1b8cf0193abcf422e7d328c14bf3757243b2294cce97f10ea. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ITZM02000226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f164b6490d2c2bf530993dfa9e7b6c70d2b52c80c318dbbfb79f7b0921e1b8. 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/ITZM02100066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b2c07f0d576aeb71fb6bdb9d7807c33a0f91edd19bda04c3610d3f9ff72e68. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ITZM02200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf812afbd71ed8be8c56b10095b3fc366c7826feee5c60d12f9099650ca52f260. 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/ITZM02300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bec0a55362c106b1f1086df49645f98dff0e6dde0683cdcdfad00ff1a2e420. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ITZM02300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317e810a9e4d6457ff7569678d63f7481e39a4b7473915f02484725a62de72f1. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ITZM02300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1783f49dc7774c1b8cf0193abcf422e7d328c14bf3757243b2294cce97f10ea. 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/ITZM02000226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dba4abfbcb46bdf85e19a3ef1f2a4a265dce162290c5e8e079451a14d8588ff. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/ITZM02500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1783f49dc7774c1b8cf0193abcf422e7d328c14bf3757243b2294cce97f10ea. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/ITZM02000226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabe36fc1074d057be6530f90d3a92f607bb1b027160e8d2b2b823f011e68cee. 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/ITZM02500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7117144e3775034b3261b5648c93c32566757b6cd7bd38424400e2a02a404ae2. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/ITZM02500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d236613021e366f8bcd7185c6178a5b9d72e1399ee5118d49be00f4b50f7f82. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITZM02500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be09688903706ac1ffa680875bf40d1181a760a68be81acb41c43c9d8dec3e7. 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/ITZM02500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908161faf7017f5ba4e840dc191f668b64ad8ef7810a6ee2df174b6258b5c251. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ITZM02000251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33fc75a7d6905bfdf238c1784a2bf836212e60ca4bc596f2426f0a8f0dd987e. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/ITZM02200044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe412e98253bd569b546faff52bd95b07aea4bf460a4559d37137ff2ef7afdca4. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/ITZM02500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfb698072620a48841db024296e2a001905191f0b215b2da5f2cf79c05ccc90. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/ITZM02500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091a9db22cc12f2a3ac3a2399074034743419db51b7fb080a6a11b892e0391ea. 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/ITZM02500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacffd9986165ab9cb43dcb697332c09eaec086053f2eedb088f9792ab8abce16. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/ITZM02500019.