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 0x498b3f265e5610f3925d7338c1c18483487e656036da77c252e71342730cf918. 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/945ee757-d606-4685-a7b4-a3a33194014c.json and https://artists.proofprofile.net/proofs/artist/945ee757-d606-4685-a7b4-a3a33194014c.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 0xb1ebce316fd5d9d02e89ac3b3853ae7569a20c87097eea6581793c5d4973fe57. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBMJG2120873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef200c3856b07c2dc75d2b75c42994f6ce14bbe8f47efa29b84f94d15139cd3b. 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/GBMJG2121214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffcd76a89eb12f0da1323bcc4c1ebb5993bcfba63d20a83bf9d7e69ddb8749d. 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/GBMJG2210415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a55c95a97b9ecce6612c95bb31990cc4d9c8345210929372ef6e2bc78637eb. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZNJX2269174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2804b4397e9a29b6578b4d1da9801903594bcb893a736e789d310ab99d531d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZW9K2238263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2983563c66990353e5fe955184d14208d24983114b2de15fc8b163f81e925421. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZW9K2238264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526d2ba35432cad6c91ddac5374ef9792398df3814d75a975ea8884e74f8854e. 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/GBMJG2206998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611a687bd5729575945741dd85d94f386d4c024cfc1073b88bf2d223508de210. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZTPX2255667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31986eb6e93f21e153bc1984116e95296ad133193c5ce144054c355cdbcb068a. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/GBMJG2116756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b228051bf12953f404dff4e760cba5de20928a5bffbe5d0a0f84b9bd684ea9. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/US7VG2495140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df8e8a14332b34db3f610243c10cae1912028d9b075eacdadf716d427a8468c. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/US7VG2495143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b86b867489002c110b0800a1d57906d44e1e3e2bbfbd72bec7f5e6cf072c4d. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/US7VG2495748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cba13d4499e144df6529bb311d3009f44f0efb57ef8ac3d58c922b5fbf7bd7. 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/QZNJZ2478165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412321122a8c27ef3153dbbf7822cf2856df52e88a2c88d0298f8e26a007ece6. 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/US7VG2542007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74e7ef236156225192f3aae4a4b13bc11bd5a4a9e8924a496b0ebce4cbe3ddd. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/US7VG2542008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a3ee067bb4495e2e6d485d9cdcfd900d74117605bce50ae99832e9da7eaffd. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/US7VG2534610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d369a136a5c5a4379badc68ac5160d7550dd1cc0cc4e076b04986e1536b86f5. 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/US7VG2542003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb748bb03c8ef225c0910bd961bdf6a2b68250202c12085b3e8ba26a44be64633. 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/US7VG2542004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20292893935935ec6d01646350f039bd2dbe902ad9613fd18e26cd27a0c63ea4. 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/US7VG2542002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e62f5f7ea1d023936191aa56ed7edbe062b3caea5a11668c3a85f706092641b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/US7VG2534612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ec4c045875279f06e1acb8bf24f1f7736591260efbe241759e5b4da54e32d6. 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/US7VG2534611.