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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 0x70e06b558565592fc375eb1e45c5ff423b0553fbff7ddc6d311d4fafc40d3875. 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/d9073860-77e9-4915-b372-5162f1dd26ec.json and https://artists.proofprofile.net/proofs/artist/d9073860-77e9-4915-b372-5162f1dd26ec.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 0xd11f17df61bbbb12d00c45d8abbb9cdba997a90a6bd7002c9b88cf5d5b642fac. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXPNM1900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841d3132e6a442e8fc87c9b30f22b06df9b4be5f2b1103564e6a495a521c8057. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/BXPNM2000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98494ce8c6bb3df75c282eb42ec7f4553ed34d1814664542d62e7a34713b4365. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/BCDFI2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e749b83fcde7f696d17d66a383bb491ab853cbf8ff3021c1b5fe467eae6b2c. 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/BCDFI2100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d42fb42f81138672d16aabfe96bb967a2070a5804362a5a27338bf2b9fe0ef1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BCDFI2100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6162e3337e8649df452a63c6f5c09203ebd47a3b830472b60da4f9a317b6c7a0. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/BCDFI2100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8860dae06f65f6d168153b6584fd911752fc10b9830ae741e7be0b56ea88674. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/BCDFI2100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a321f86fdeac1ed3c44f223c7d1c51054494e1fa437f0a63815a1eed25cfa50. 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/BCDFI2100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63573d53f08d29c0998b2e0b964bd3ab090f6b2ed0a8841f037be8ceeb48c90. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/BCDFI2100074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed37c81eb9270e3ea1016df262c025ae8d4dc1c2123b912430577a408639fe1. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/BCDFI2100075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69746d0ffc314973bafa45ce0a024083a86b1489c97f7c557e1715d532cb1419. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/BCDFI2200057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a02a02b68ea3ded74f9893eef5924a3025505c096b32226bed5ac5ab2f736d1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BCDFI2300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1def07e6345be1eaadd10ffb3f9a4c8433008a4c2b6a6ee3b4a3e51978e288. 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/BCDFI2300076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a3d0b5766f135bc59fb22513fb2d6dd6c74aff3ed1d893496539e9f013b236. 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/BCDFI2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344fee1bcd941c8de37e7cc7a09e3497284b967fba3c0c94e69a51ddbf9aa9be. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/BCDFI2400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d02e69dbe874964dfa0694040cdd37163a5fee54ead89e301b9b686e2084b0. 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/BCDFI2100011.