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 0xf7970b3d75ab1d70123a0f01a2762da32e623ba38bada4076ef059ba80923e30. 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/8c0f59c0-1f18-4f7f-ad59-bc146cdb13bb.json and https://artists.proofprofile.net/proofs/artist/8c0f59c0-1f18-4f7f-ad59-bc146cdb13bb.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 0x88a13ba5fee9f4afa637707e16a30f24f282a9dade51d2778779b69de3122788. 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/CH6542167483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858141ace844f01166835b5b9767424f0900ad63ea2aedf90eed4b7820ee1847. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USHM82157041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2920e3566d7ccdd085c51b3728d0ecfbe745e3524741581a20c2f3f03347c138. 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/USHM22284847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3413317e7efe8842bf11c34e4b6b26399158ea5368d6c3ac430c129e7f1a28. 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/USHM92219425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0889c3de54b87d8025eda9fe7ceeb06322514419603e22c92fe7a53ed222c033. 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/USHM92286714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd231bca95fc7e8589a0d8fea1bebce428fb3cf6f340cc561d57272f85004fa8. 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/USMH92376920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa59e3fdd512a93838b4017793ed823d4f95d999262d2754b8234d412ad8980. 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/USL4R2307963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53306ff74998fa3acd37d3b75ca69146fffbc051cad90cc4dc3b3529e41a656d. 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/USX9P2335778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da43ffc18891483a17e6fdd472df81c57cfb9e8ed5ab1a194aa1d346733d367. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USY282324537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bc5ebd423f03a8987c50edb1401363c2f2e5ea3bda9297d34a94eeeaafe48c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USDY42486857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4844308401ccddae7a558c2952f9dcd21d7ec080e2b353debf481c88a9093d14. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USHM22478373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1401bc5b21a136fedca5a421c3e8c1bde39d8528381597e53f884b49e29eda2b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USHM22514359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43746099e9489662d58dbba1790a3e48020ce0f43c843b4058d9724b8c4ef6e. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/USHM22514361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfd3dffdb649f01e38ba490913c48a261a63a2ad7b2fe0d00e4958ac6408fba. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USHM92575643.