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 0x64339618bcf329089272776af3b1618476c255e9c14c8ef2513e04fa3669169e. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/559cf57e-6b44-457e-b339-12ec3afa87bb.json and https://artists.proofprofile.net/proofs/artist/559cf57e-6b44-457e-b339-12ec3afa87bb.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 0xe821b4d35b52a607a6a5b2728a24485eddb0f5cbd0c79316ce0c75e14d04d4ba. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZFYY2509043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b2be70116e2241e15ad1f40c60bcb98a31a14c3e86b548aa9b961d29a714a9. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZTB92468762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcaaa4652f7e0c6b199d129babea8e054703f402d76ad70b86d0cb0844c66b55. 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/QZES72586595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c074e93647dd57eb2873323ce4f587a453ad6ac2eb4748a501e252b79ad913f. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZES72586596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe821b4d35b52a607a6a5b2728a24485eddb0f5cbd0c79316ce0c75e14d04d4ba. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZFYY2509043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01143ddff3ce5b723d26bd51b50eca495bb9734ff914d47618a937f5e69af56c. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZHNC2524079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c074e93647dd57eb2873323ce4f587a453ad6ac2eb4748a501e252b79ad913f. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZES72586596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe821b4d35b52a607a6a5b2728a24485eddb0f5cbd0c79316ce0c75e14d04d4ba. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZFYY2509043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549cac8e6830c3abae556e2d3672005dcdfc727ab64f4dfe125e107f53f277ea. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHNC2524080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c6c6555f91235add3cb4117d574c9c0c3652280f1d15c7bb392796fcc1f41b. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZHNC2524081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65929cee4b9a75df4cbad05fc5a86b29d0eac693adb86f91071f5731085312e. 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/QZHNC2524082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66dfd95f3cc31e29baed086100be88eea598c9a8a44335989207c216dbcc317e. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZHNC2524083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d16d7bb916807939f1adff69d56172a65da8db46a22da2af003cd555ea8b3de. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZHNC2524084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db9391151942c47ed9d1dc29b2dcd24ce22ce90d5cf386fd5626e1077f5f058. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZHNC2524085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b2be70116e2241e15ad1f40c60bcb98a31a14c3e86b548aa9b961d29a714a9. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZTB92468762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc62ad7137cea9837511310f16f1b3abc14c5238e634313dd0b5a32937531ba. 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/QZZ7L2475915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748f7426ab6b276acd01e6f416e1cf2cd944e97f46c1a81b0a3621ad09f2e54a. 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/QZHNB2547057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee097bb6f61ba9868c1b31524e74d1660b589de3ac1acc8dc0a409f7f82d864. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLC062369495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0db43e5f64f1d9ef54e5e82682911cb0ef7da4af030f283cfdec71ef2015c97. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/PL6B02481177.