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 0x62ebc146f0e879d39e972551dba8b8d71397b7eb98f6fec0aaf4d94416e07820. 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/47d09877-9dde-4c45-93e0-4fb51093ecf2.json and https://artists.proofprofile.net/proofs/artist/47d09877-9dde-4c45-93e0-4fb51093ecf2.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 0xfcf4ba76ef479fe01127357323005f22ecbe074adce89dec39317cdb3ae1fa09. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL1S32400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953031eec05675245e8782a7f05de7df26fe7fa6db949417fb551f3e71abdbd3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NL1S32400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c270672793693fe93600dd6dae32e60906b0f5aa2dcbf7f2f48fb637ad6cbf. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/NL1S32400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed85ea097d986e283874de067fed0e5a61df090079be8882ea74fba88795ea6. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/NL1S32400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b968df055647b4419175e71411b7acef2e1966903f1f50746c6fbb786496e95. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NL1S32400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1d3e3c2ac28a9286bb8b517a14fc3b78cb49a73045eaf3827d4dd2cac37ef4. 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/NL1S32400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3898b22137d6f4a31f2481a788e4fd6d4056fe9d623bd5072f2a962a2440d0. 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/NL1S32500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3c0156e1e5ac5187fae8d2ec28a7d575f4f874c349d9cb0459a793fd3d6778. 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/ITR442300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c40a7b20a4f90accb104fc6a8d6af9093d286c1bf8741b537f6bdaa184dddd. 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/ITR442300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66836082b3cf9113b5e5cb20df4768de1209d0b1dba3fa60704dc05eada1f9a1. 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/ITR442300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce49d1076f12346b02d8cc33b5c5180b72d6005a60d3309752884794b9c17c57. 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/ITR442300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e52b8d5df8d92c871f5244a48f04a3fd6af6dd0f2c386d9c9a7c4f66bcb7fa6. 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/ITR442300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7a542fd111451d1f748c55d0b3a1706c50b154e12a28896aa861345c580431. 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/ITR442300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661f3e23a5c5354341f85cc049acb8ffb145f0e755ef899740ef1fdbe3c8c727. 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/ITR442300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767283d908b0b78b056bb618f5d6ee75b6f52c56f4f9794f4ef42615e0b3ce7f. 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/ITR442300080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce49d1076f12346b02d8cc33b5c5180b72d6005a60d3309752884794b9c17c57. 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/ITR442300040.