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 0xbe14305854d215279f9e0a90993b2a3142c401d99308c0e5b438269ed2a19a1c. 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/0f235b72-73a5-4119-b0d0-9b621b8ba87d.json and https://artists.proofprofile.net/proofs/artist/0f235b72-73a5-4119-b0d0-9b621b8ba87d.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 0xe7def997696fc7843122827abf3d8d8d7b603f2c491ead983076071dc5505cfe. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZS642268915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9018549b556151e7fa44d5f1fb45231d88872476c4ec727936fd8127b9d7286c. 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/FRDX62210690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af61175797ac7973d0cdf6747dab950bc76916b5ac5a659342edec9be368194. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZMHK2309723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7ecd94e52cbd3a37cf7b024628f8360eb75a654abbb6ea35f5a28ef43b2e75. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZMHK2399198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514049bbcc604aa765acb2300814c3f66ad4dbc1631fc290a4644af871ed9978. 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/QZS632352086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b7c95cd985eed6027eea482046aba1c9d3f58b447c2b36bc4e2b588ab27f52. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZMHM2362282.
For Those Who Like To Groove - Frederic. Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67eafdf9bf5494f7e517c6706f40c95e9605791e611c79cad163616496430e3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/UKN6K2300206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc036c9f71a5c87786c062f2b17465b1351d713ac912c97d8fe67878ea7ede916. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/NLCK42235381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0366d9b02bb819e037e2999a891b234bc1f97609b32ac5160c370608b6f152b9. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZMHL2464845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc240c5d4117f637b43cd7410858f8a2075ef1fa158883272f10ce16af3bd5b43. 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/FRDX62311580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7ea0a7d2657358df137d80003b62728b22b68b5b5ca9bd702f21bc19164216. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:55:25Z), 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/NLCK42407865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cacf11fc0b2347d3121b465c3b2bf307e2ac5f3eaa59f35d5ead06d25f250ec. 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/NLCK42407866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb783c09947e3e0f604cccfac352c4a46ebb63dde09b122cffcbdbe4d148c61ce. 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/NLCK42407868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f7408a5e982e2ffb81a6fca5302a700b9a50783a30f0865ce00d6ebffbb753. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/NLCK42407869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d088e632866c21dc76cc1ff522ea316aa3eaa3ba3f0ddddebf3530043adde1. 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/DEH742302372.