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 0x8ea3f088f7b5a931f75f07240cf36de5e308214bd782f83a05e0dcc428a0f71e. 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/a02814d8-4607-4408-a522-867c8ca9d134.json and https://artists.proofprofile.net/proofs/artist/a02814d8-4607-4408-a522-867c8ca9d134.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 0xf9dd3ddc05ba752b33bc7045d49ef917d55d3829cba5aca28226aae0d3e24a3d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:54:53Z), 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/CNZ502201145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde5ca9dc6697699139db96c8bf1aaf623b8a75cb6c6e3ae78a57278a772f5a33. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CNZ502201678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9a27596daca0eae7c84c09904268cbf9153ce61b9f86b74227e09bee819d6e. 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/CNZ502300498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933ffa01b9d6bc012ae9e89824343399e82c6a8108d96c80caac3922326fffaa. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/CNZ502300499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd1f5b70121790c9011346641d7078573e55abfa5db4a5aef5796b62c1b72f1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CNZ502300500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949ff84673d4e0b44310c24e4765bf756b3d54f6b9afe8f58ce00dd64e413d10. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:58:37Z), 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/CNZ502300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e12c0232a6f292289a63becc671fe115cbc8767de06f2e8b8f5028162f8206d. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/CNZ502300502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44423259740c8f8480406880030be569defc60d020085078d9d2b7bf2d8c8d55. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/CNZ502300497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc426828cd6a9ed008ae78b82ca8ad5ed1d1449f2aadaa2aad3094f9c64065ab3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/CNZ502300503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309ce2a30f1ae4716b512c233a7a71f03c005c9e21626e41c4e87cd1af945d3e. 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/CNZ502300505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8eb12284bbb01762a9668c10f87d7b9fad1d1be2c8bd22e9fe687d263298a5. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/CNZ502300478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc01460ae71aaddc6ed6ff156e8e7347c674b4a5177dd0acdc58f674c97ea02e. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CNZ502300496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614e5c5f3a18350994bca3c33406a73380c48f9232bf07dcae786fa6f93ff1fc. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:01:31Z), 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/CNZ502300506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde2eaddb88c83d17fa05651e6376767ac504df8ebfd4459c78d91c00ec1b9a5. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/CNZ502300507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5887fb864dac30e3c682971a844141f16d1d464c1bbd2b145f3e9a64fbe03b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:27:20Z), 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/CNZ502100205.