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 0xdae52b2e3b810aa95442d83913ede09bfcdc820a89786b769e5d116a53394438. 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/5b9aacaf-2183-4c0d-904d-083236f2e8be.json and https://artists.proofprofile.net/proofs/artist/5b9aacaf-2183-4c0d-904d-083236f2e8be.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 0x163db0d8c3fd0d2ab48a90f6c283e7b69c491996bd404c519077cb913d51e23b. Chain 2 (Bitcoin): anchored in block 957720 (2026-07-12T15:26:09Z), 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/FR96X2314598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe927ff7462ed7a7d07cce7b5457b834c2f0c32a1a884bf5d457afafaaf67063b. Chain 2 (Bitcoin): anchored in block 957714 (2026-07-12T14:35:57Z), 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/FRX872291579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e175d0709768f3f3ade226248471cad3418788be82342af0a826e676a175e59. Chain 2 (Bitcoin): anchored in block 957717 (2026-07-12T14:54:03Z), 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/FR2X41983288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82d77c4f103ae6253387f5a28e1ccb528352fffdbd2439a6566a28dd39a24d3. 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/TCAJA2450578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a964bdcc9764b3cf29320ba12529b10b8dc75126a2a2ecc31579ed65362b789. 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/FRX872291582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298a954f3a01b78e2f58e08d5c0659be5cefd7ca24bb5d672f8a940d122f85a5. 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/FRX872217474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d732e8fc3d209dbd608157bc387d1a7df1feca72a158c0080aaf3201e489152. 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/FR59R1905176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5946cb44c11169b67638e5ac986dd9f2085562e375e40b4396ec0aa9b53919. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/FR96X2314599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2340a57e6a9b1143017331a4d85bc05642c82cd80bbe4c4b2a0aed37a6316303. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/DGA072267822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44708e4c3753a17e18d4e436365a6dec486633631db4db163383f7907c0d437. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/FRX872217475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe966f8ea7a491b254b3a1edd40e4bc409f7c01d8614742c6ee4c71ab138cde0. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/FR96X2314596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204ab415c74d68ce090c08b58c82b7a6f3f433e6ccbd1a848f49cc424a626a57. 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/FRX872217473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c8ad505b37bd6075b339bc951a51882e1fb5277fcbf1fb0f6aff7216f06ae9. 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/FR2X41983284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf80b25ec798b23266ab3097b3220b42ac64fc07499a350cbfa15eb01371f1c. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/FR59R1905171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306224cf7a4ad4c990cffd85e4b630dab2acb01dd2f9e655872980345c7a11c4. 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/DGA052293551.