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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 0x54e717e68399f320098e34ef2c809958a9417ba576b8d1fd21988bb3ef308fa1. 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/0e4820b3-0a60-4e5c-a6c1-ddc3ef0a19dc.json and https://artists.proofprofile.net/proofs/artist/0e4820b3-0a60-4e5c-a6c1-ddc3ef0a19dc.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 0x33e63764f227a39954e92898e5b1e146acec62b179dcfbe35a432a3b3f126248. 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/QZCE61886975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010bb42fccb4f248e81c3d0de24842f8ea621834c469269545d498e27ac7b4f0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE6HN2262718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d72e59e51e570c9010afdb6ae82f479341da4fec0e7a794bcbf44fb836695c. 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/SE6HN2262739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab692323c8d182c5eec95c277f2cfa04f2ce774ae787173ae76d4a9b3fa0aee1. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZSYP2274704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa927d049a277199b6196f1b844413957038368108602a3a94ce7ef85943abb29. 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/QZTLA2372263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8008b627acdc9af88918f6b910c703dfdea4f6bf18d0e2d4a622c961afea2d. 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/QZQAY2387706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad9771d6dbfa313c642ddf04570f65d15569935c3808d17363822df823212e6. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/SE6HN2262727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21b035c4955ef06336611eb02959ac85cef7253501c34279a842d6c1485a4b8. 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/QZTLA2300737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5034f3bd6009d584df98f144e072a0d3f9f544644476391dfb31f818c31f8d65. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZTLA2303518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319788e52251267978f8b00dfc5723bf4be80608de01bb749fafb359630ed46a. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/SE6XX2279374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bfbe997a2063a9d7f02f7f21833967733eb68a88127ce159fa45b96dc03323. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SE6XW2275002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f206d8c06bc62dba24507a34e2d268d0abeffb4758c071af651212af59ddc5. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZTLA2316543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054f1d5ee0e3bfa7060000f08749144c60d8ca936f3db92a33dcd07100d0543b. 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/QZSYP2301171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104c12d424b23f12fb1c16ad520f79a13f6e9f2a5e367be6c0b7fa8ffe2babd8. 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/QZVEM2305661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa927d049a277199b6196f1b844413957038368108602a3a94ce7ef85943abb29. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZTLA2372263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab692323c8d182c5eec95c277f2cfa04f2ce774ae787173ae76d4a9b3fa0aee1. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZSYP2274704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb365a22e2e4aff5a0bfcca5478fd5d374c6a6c519c4b73f578e2826dbfbe0a1b. 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/USA2P2114968.