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 0xcca1ccc490d4118a4a86a04288434e01e5fbce3c0540839917a68e03f1b2f670. 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/d9021d2c-5111-4f6d-a6cf-bc5abe48ddee.json and https://artists.proofprofile.net/proofs/artist/d9021d2c-5111-4f6d-a6cf-bc5abe48ddee.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 0xfb1028060a95b5ccbef0c7a68f722ab659bd1c1f2e1999aa0274e8d29b3c5c84. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CNZ281602204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe759b6c1fc9a0ac265ad24589d48f55b7deea80b588ff928a3772101147d7b0. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TWD970200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f3c2ff6abf3e506a3eb33e4c4e843ac97a1114cf2b8090622a6da24c41560d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWD970200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca27e52d47fb19d203b789d9a72a0b4e3064caf9d68f455a549f4dc0e2662380. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TWD970200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059547ddfcff9ad55ceeeee08eab5a2b73ab91da21587f02b763f02fc3d62318. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TWD970200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0621bd9f55fec11299093c50ed21a1bc2de2f06b77db44f6cc8398250e25bb. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TWD970200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d55f863fe54b6460edc44bbcf50fdfef986c1f68981ff3af7c2a72902437afa. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TWD970200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110d3a9b3c2e7d543d42d29876704651b0398f2fbc0820710c24019520ac2c4d. 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/TWD970200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8adb97811ca0b8a68b406c1f7e8e4be79e1ce3bd20986d189d19a303a21b38d1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TWD970200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc565c84f3860dbbc90b47e4130fc6c3ca2589a1b3cf380e2cf395f2108a88746. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWD970200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc752a93217a42782f6c8503b63ea6f1db97fa35b82c2774fcd9530e39ae6ccad. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TWD970200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308e6a7de3b05c35509ca379d986aa036ce767b8ab99293f8ccfd5e440a8a430. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TWD970200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ca2fb8bd5b94a00cf67eb9142eaa7bcc5726311cd72c795e17e33bb68cd42d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CNZ281602281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab58252bf72f4cc5db1a2b6ab1b59617894593375f1296b057bd697a34bf939. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CNZ281602303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395c127fc3a323117d3f28b16a80ebcdf195faf1a392ec842e6b47e7659c0119. 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/CNZ281602289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f27dfbc072e93af61281e34bdb6bcc364f7a59a882cd8be8ba6b873021bb7d. 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/CNZ281601678.