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 0x3bc811bcc4834b982c4d3f60a67b14d3709379d679b1b0bbdf268bc83ca22546. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df18c411-faf3-439e-a091-e4438600e38a.json and https://artists.proofprofile.net/proofs/artist/df18c411-faf3-439e-a091-e4438600e38a.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 0x154fc322dba77b3c8b1ea09dd72f42b77825ae051b4bb8f4c73fbfecbd1c20e3. 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/CZH202400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a37801ec1de66ba21648b28f3a355d8d2820d7f9eb9cbc9247afc055005a9ee. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/CZH202400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87581770efc686df183d2c4594538ffcbae4572d7d38296a1badc03450c6ad63. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZH202400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57c623d48f061d89dd94450a3b39109e26a3d463de19a0acf899bc3bdbf0cb9. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CZH202400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a38cfe9f1b022c76bf5628512da08b5f41fdfbc817a566a475074e66c5e298. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CZH202400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82162c63e061637ffe1f19a07986b9d534e3f64aea8bd02230821d1482de86d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZH202400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4878816d95e4ea1f8f8073db17a47974d8b0af5a0a3b5eafa1fac8efcc0bd312. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/CZH202400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9aab490aa1a1ffdc7b2b26843f36dae44f07c389e2557943ccb5b559e27e2e. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/CZH202400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2cdb9e8557826da96c4654cc47555c7a229b6ecae768f31795572e9a026eaf. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CZH202400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560b4e9f176355bcf673d250e8c1cf70040085e4ae9627f9e1323598d4b5f480. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CZH202400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e0c5c4afddeb36a31853975e10e381350713621370fc58766898c00561af61. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/CZH202400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b9dc71bf5d548c77d2b24d76ac3d82475ede56f7c4748b5b1cd271bc56f0cb. 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/CZH202500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093a80225c46eed361144a0a4fcaf549b309079d3f9836e0ae08aecde978fe8d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/CZH202500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130985890bae777daa1fb505a1633b3fa11a91b075d0e7180d43fc451a835dba. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/CZH202500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f79c51984a2086f0a589139d000c26353f029c57d7cce8d64cec664a94804a. 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/CZH202500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbb76c47eface8d24549f5cb4e5bb663e6114470014bf2b1ee6bcff462042d2. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CZH202500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272efaaafa0322256a83009d6aac881541956fa9ded33eaa6cc531fa3eac962c. 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/CZH202500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e3ec964254674d9e01f18b870bbb6d93a0c6852305f615c5f759a0600b844d. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/CZH202500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39523d649ac305b8afd2324612952ec95f02a0f95152868d0a777a4e3a34d3e. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/CZH202500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc50c6fd17d8ea642e798c44b61476335321f0405cddd4717659198b1054440b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CZH202500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38967baee625e7adb002d720c69b4ea39f4ec31e0f039659609cc28e3e49f7a5. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/CZH202500029.