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 0x7376194195e7496dbb783913fbabb0b487d7fdb83a87c621e02517ce30a845ec. 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/023d31aa-f5ed-404d-b809-4b04a14f560b.json and https://artists.proofprofile.net/proofs/artist/023d31aa-f5ed-404d-b809-4b04a14f560b.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 0x3a2c73e9e35f9517f9d0cb5942b6d5c032f12b0c96764c59120518ca0ca89531. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZ5AB2358731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf23a88ff12fe5ca157952efe353c9199239645897e93f36d4ccad877bfa89c. 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/BXBGP2400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf754ec259e2648a36b25d6423c95e70c58bbefdb86b427ee98a19be6709b5cc1. 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/BK4442400164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ff1d35a3c64a4e0810715ab9fa931774abe6e1ce51e7241e9b8720134986e6. 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/BKNDN2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3fa134345e5d1463f2c07e9966cc88bc7d111563b9e6474aad6cff94303c34. 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/BR9Z22100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581ec631795fd9e777add31f71ce3a80dcd4e372fbb9f10a05a6ef01ce8166d6. 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/BR9Z22100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f122576539ddd68ffd735953b66556388212a6b596f530eed7e6ab6116a9ae. 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/BR9Z22100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4945003c48eb9fbbc35fe000caacb4e45673fcfe5bf808bd19f3b48a4ab791fe. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BCIGI2300043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6fa633c108cb217a8868f4faf58ad0fec72ecb29d4b0d1f4e5c6f8b831063a. 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/BXIV82377744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c41d893d5df5fd3a7907685a9d292d9ec0e49f5483e860789e46e4bdc544cad. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BX6ME2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6f9e964c4142ae7716a74baaaff5aa98cc4d0ae3c0f2d09141ca65df7206c4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJZ2204958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b90260f2daaa8e52f3a58efc9da906054f15419c091ae01121f2aa40f8783d. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BX2972300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087173b52dd37b2e93775c51ebaee15427f393a79ab7daec10bf1ed7c599f968. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BCJRA2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe527f589705172724c3459d86372c79c764b9b0c0a735d907cc0bfb975ec67ec. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BKBFT2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7778eb1482dba716574e15e4ca7bcd532c307763dc61d1e3072f972381dcb1e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXCZM2300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808cc99bd552757a5fd70045e2e4e05190e20c5369f0321c8bcdf76c2f67f60a. 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/BXQHQ2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628fc5d34e84d17f5f406d76600c9f6eededfd90b278221b3b276c5add7df803. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZGLS2393115.