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 0x25cff8bd1422c4f61b4865d5f298352fd96ab50913915ea99671cc0fbff76ce2. 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/b80e4181-260c-456c-b625-0b5fa3f117a4.json and https://artists.proofprofile.net/proofs/artist/b80e4181-260c-456c-b625-0b5fa3f117a4.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 0xdb3648faf33c82ee5caf955c3cfd989b62a762a78be16f63f527278d5bfdf2d7. 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/BRNFS1800091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd5e55e491336159f825489a16a15e5564320139831c5955c340997fdd66251. 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/BRNFS1800093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b21a20b13b4b6d848920d23899cc798a1457309bc72c6370977cd2272aadeb2. 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/BRA220512275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e35742d358c516641470bff81a7b70d600e6c614acbb7903142608fb129828. 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/BRNFS1600172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214e876fa91a89766d721bc23efe4190451dd4737f80705fe5bb9488a2fc94c0. 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/BRNFS1600174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c78c30f583e00bc20bc7fd76c1d6533fcab9a2198590b75e96e4b7eb7de210. 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/BRNFS1600178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0572b090341989f9d42a871d3e097302e7eaf0d39104be90a83855c2307c8b. 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/BRNFS1600179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dd13cab1c10530e33c32c00211f087c0c20ccbd54bad64ec4760a6afdee4d0. 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/BRNFS1600181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7226e74c2939af9283f7768ac4f8f004af17a4518d1a88b695c5b3fe19a73713. 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/BRNFS1600121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa03158627128b4cd0e179e6bc200ddfb3b3f764cf08cbb7ede8d7a129c3798. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/BRAPI0400200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d66c95044a89e4fe253d872906794ccb588b37353453d82b1e00200a64295f. 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/BRNFS1600149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd02273e1302a945acb291e07b17aee9b0759dfabe083b8c9b85f6dd65c5ab7. 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/BRNFS1600150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8331b08eeba84004349ed456a2632b4b57c46557f32f9b615d92955e10ada0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:30:03Z), 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/BRF6E2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a16b0733279399bae8a1935547b4bd6a9367b52a2b67ef0ca673a308a6f458. 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/BRF6E2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705be67841251f8498c596048d1cbd812b19483b70ed583931119a5561618f30. 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/BRF6E2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c59b9f5f1dcdc6e1366af6e4580f4ad913ce8011184d8d4ecab4037346d127b. 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/BRF6E2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa638ec4aea8b9e4778ec8ede491938b2eae2f53152e6f8781deca368ca0425bf. 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/BRF6E2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e948dae1c99072385996c47cb0d3f1825f0b354ed8a2990f8dac996ce99d7fa. 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/BRF6E2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ef2a0fbf0ab685bc48de0426ef7324e196f1299f93d002f1b8ca91c0c3ecbe. 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/BRLMJ2400001.