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 0xb140a9a2e8dc6ec85b9d6e63aa81467601500828c22eeab7aa36f69c71ef0625. 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/78f16139-0a4a-4b7f-8c05-81d3781ea0e4.json and https://artists.proofprofile.net/proofs/artist/78f16139-0a4a-4b7f-8c05-81d3781ea0e4.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 0x5ce37dda69be4bb239cd81990d4b98029ac901326f44b0ed903967554c4c0d36. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDA51863582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e66ee072790c7d1fca856bea8663a378f21562fd4999e23c565733955f9c126. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDA51863583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2056da696cbd4feddbd2139122b5c46d639f02e25a71ea68fc2a4fe7da3b7a38. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZDA51863584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d01f59bfa4821e95e835ac86028df433d3f1f74846cf31f9f8a0e90db112b4. 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/QZDA51863585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2678258ee1eeb7b33d1c677eae8527b3a410ae0ef9bbffaac08a48a5802be6. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZDA51863586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9353a4bf02b63716155af65a915253ecf46c0e58e0e68995a4239df079a90505. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZDA51863587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f61e139ce6bcaaa6930a943a86ed18d97ca6cb0dc833db5e6fa2852dc53a54. 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/QZDA51863588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611bfccce709fe7e3f6e752b2a7dc6aa4c870435c16c8adc91bdcf66a2166bc5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDA51863589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbef41abba4ee1c8fa8e4d173f68d876c624ca5bea8b1b0787a300645739b8b. 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/QZMEQ2005662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb108ae0b53fc2d49013721477597ae4d1f6fc446d48af76021f30e19a25e0080. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/SGB502249225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4531fd2ac7de21500bee209303ade78754c0bf94bc1ee8e45edb36653fa29b. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZK6N2198717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7654b552311a1697cb35ee72b9ae390f4389a2d1d3a822ef7ef3fc88b18cddf1. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/SGB502249221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2d7d6c812d5f9643d557634c53b9281ac14a59ff837ccd14a169847214aadd. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/SGB502391165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18188ae28152163106505d07edadbacffdd17a5b707a8773b780b5ef1f284884. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZTAU2442598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bed8fce9a554d3852d009e7713b30eb0daa40d09ea46dfb1be7ae82efc73ac5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZWFR2542185.