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 0xe2f4210a78b259f0fac617a79a8b0249a61c856985cd9dbd0bb370ca49aba38a. 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/78f0d61c-afe6-4375-8d20-5be1119599a9.json and https://artists.proofprofile.net/proofs/artist/78f0d61c-afe6-4375-8d20-5be1119599a9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xa8a6678100930eeab8f8370741f673d49dfa69165ff9c259e8c817fcbf0b7b4d. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/NOX9X3703101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575d37fbde09db6a404e1adc50de2d0b5c89cce8811f6269c5b3962cc9ebaa9a. 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/NOX9X3664212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23300327d2e9bd6a081cabe9df17aac222b072beb36b5f3a1e6c01ba0ebfcc3e. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/NOX9X3703006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6dc72801ce68ea20a2d7908f36300b87f633e177154f8f1b91d1b8f0700f78. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NOX9X3703009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940ff86ce072037b88cc6f14ce963519e584c3a53386684e5a1e8d927b961cd0. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NOX9X3703011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2adf25e9a3188e1297d22fd2793d4b5a91b6d4aea6f16e1e1d9ad4420e6230. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/NOX9X3713701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e66ae5e3d720f6f58ec24db7aae1740fe7c8ba1d21b75a66d9262896ba5ec82. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/NOX9X3713702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82448d277d72838c1e73fa5c785cebb17b5f755b2bd6e74399db1c21afd283e1. 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/NOX9X3713705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5040ec7a8bcd44931e72afcb59909a1aa9a0591ea7adc642650a94ae73f4da8. 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/NOX9X3713710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc490e52080a490e59d84fd000728ab167b0c5d5586341ce666204d6202d8a1b. 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/NOX9X3737604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde25219d0c0dde1b76842f5bfe7fc9aedeb0e7d1ccc15cc1d46f9ca8e7e3c316. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/SEMDA9756020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9570b178916ac73aa8cf5694294370c1d80dfd6808576d918b8a1c18e8062d2. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SEMDA9756030.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e757b8e1906413a24324a3240b2a4b9f0b4b5b8f4d87938f409c6f3d01f21b2. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/SEMDA9756040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a7314b666bda88bb1996cd1dddbf34e5c789347473c6063ff893c6eea02688. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SEMDA9756110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ec56d22d05c1364886c2f92a05b19a07a5cd53f8cf6b43bdd61d369cb09315. 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/SEMDA9756130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4929df7f7cc8691914f3e294885f0383dbfb60b03739e86d02879d1517c0f4c3. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/SE3FR1400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6161f1b573b1a5ee8ed38168c7c04a5e9a9b56a996cb2560659b1960a194bcb4. 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/SE3FR1400212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1bff673219771e261168ad2c6b20df4ef4b8f5720042234da8d305268c8b12. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/SE3FR1700102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb618dc14a4dd3040dfcff61064edeb8077c6159764f4f542ba4ff5d515dbe9. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/SE3FR2000101.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04320dd605ed24a96421950ddd3410826e4fcc0791043180059a95ca27a056b9. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/SEYOK2031123.