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 0xcd9699d69aa592ecd18009ca12a07afc74d31c589b504ae9e3f1738c3fdf05d9. 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/a18c4fec-129b-48c5-8a2a-0dc5376dbff4.json and https://artists.proofprofile.net/proofs/artist/a18c4fec-129b-48c5-8a2a-0dc5376dbff4.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 0xd2a4a1205946f8eab317307b198735635d482ddef39758af73dd0a07bdd674fe. 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/PLC062416266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6abcc342a5f5b4aefb5797b7fe0999cc48228b75e826509bf5c5e4a56ce4ad. 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/PLZ622400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bff9cb8122462e5a24ad740134ae87b658beea82e0697ec50b6526c122a5b04. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLC062257916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417c262e559de2c4fbdeb3fac1f015af081c9106200a35da4a6bdc58a1ffd87d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PLC062234230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1e053dc04d898f3ff3e166fc2daec6ff875ed44967577951bf28b7c452195b. 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/PLC062011430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147a8ab3b570f8b0e9d536e16bdfae5e68d6933bb5e1febdf1df6629e67900f3. 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/PLC061908706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c13a67296c4e28d03be040401d58017d2a6efceb8830b1f56b8beebca8e44a. 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/PLC061908575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8409e0606c5cf7c5aeb09055a19a8303c59f207c0a800b7596853ce0a21a6a89. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USL4Q1888372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48be0d0f613e23e1b2772166404e4718b72dcc95c13ebe8a99f30e70c225aec0. 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/PLZ621800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7d7a28dafe068a3c769ba7957300fe324d7a104602e3d3f74903eff6291d24. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/PLC061908574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c13a67296c4e28d03be040401d58017d2a6efceb8830b1f56b8beebca8e44a. 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/PLC061908575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ef16fecd834b7b4031708ccd7e7b8287fc8c7f5ee051feef911ce09c728ee4. 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/PLC061908576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe267ac5413fd1e4c92365b18b37b75b128ffd82b63e959c9393789451b363309. 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/PLC061908571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c5b9ffa326a590fde3eed2a85583f0697cd033102bad02fa68477cc483ebdb. 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/PLC061908578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa525a9fe2c932764a9ac615158bf2d8bdb95ff613a0ab58ab90065cc4a45c961. 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/PLC061908579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c59451ffac35b34eb57c3584db4426405537675b1fec9f2a76e7af4144b07f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PLC061908580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef03ca3b70f5ce9928a4a0270af59ba242ab13ed9b6e5a2bb4c025d2d13d133b. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/PLC061908581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39eafa1e88f57dca76c7336f9e1864f735be5269f6157e6ff01437a8b9b9146b. 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/USL4R1817200.