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 0x7925926cfce5bf38e2dac26fb4e03019f3b23e58a7fdcd9561a24a10fbe95dc9. 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/7b1baa9c-27ab-41e2-9a1f-5bb3cf91f31c.json and https://artists.proofprofile.net/proofs/artist/7b1baa9c-27ab-41e2-9a1f-5bb3cf91f31c.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 0xd65a11ccf2eb0810f8d0625ac8d0517c96f5c46465a9868fcbbdf5c4aca10f9d. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/TCAEF1942407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a33a870f76a1ebe62c2aaa1021441a37406a9afa491fd498531b497aa6b1bb. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/TCAEF1942521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dae370ffe0ed0cf3a1b8fbe73c5469667eb8e4ed739b36f6b211821ed67be45. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TCAEF1942544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a849274283ba3a1ef7af88ed78f007b700b046f913395b24467cf1e5fb2f1f. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCAEJ1929133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672db23816cd2d31d9ac061f2fa3636f04eff4e3360aeb60539f1c04558da4ea. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAEJ1929134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e7fc4ac8299029deacbccba0c7aeec068c89c26701618b316a3ecf61e50af1. 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/TCAEJ1929138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fc189a8eb800f61218c4f5320c6a44d1e3353a3cc6e4e00671978928b6a054. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAEJ1929144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e87b6dabd8244c6db5e7d70aed4a12fe509c56f041f39cc638aa21f57aa411. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/TCAEJ1929150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aeaf3160aca97ebb2fd16cb56efd7164cc13ea9e2005d5582f8f9ba37ec7c7f. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/TCAEJ1929153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d5acd27fd717d36f655a38ccc6f97088ab408086a420525c363093f1cd074c. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/TCADJ1708175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f35e5a8363c5f7cb60c6572065d810e80ea9570295432fe1c4b352e91d95fb. 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/TCADJ1708177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1263bdffcbfe875fcae4bcf41d3bbabf3efce74bb5f16caade019f1634100af. 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/TCADJ1708181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf96658a7e867bd93eb1447192d545f4bd77706b2493abba8e180bfaaf2997ed. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCADJ1708182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7424b928a901a0252cb67652212212e0b675663b43bcbc8f140e0be5d48258ab. 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/TCAED1909065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0e900403b533087d4602225ae7ab52d21b7ad6290e30f09acff632b5acc975. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAED1909083.