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 0xbd16ad2c6da1b425ef0c7841a6168e94069258af1667e6793e09d13ae9ebcaf6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7469c096-9f37-43f8-b929-e9f294e8ff86.json and https://artists.proofprofile.net/proofs/artist/7469c096-9f37-43f8-b929-e9f294e8ff86.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 0xa375da5625565636f3bc8eb0f222dc690508349d6c6a4722ffcc2d54063ce991. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZPXF2120014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380bf1b1e0e104c707d71da3b3e8dc802c6b1283ac51b07fe1057d83d2ff153c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZPXF2120008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6585e81033cc54abb89dd061676b7b44084b03232a9a88e63c90ab68bd5ccd11. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZPXF2120009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a11ea9f7a16ef3d5e7769537660cb4d4e7feeff929d4287b30ae7fa7a6981ee. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZPXF2120010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a01b8ddc30ed1464936e6c40781f44fafa330ccb9b84515ba68b90caecdd9f7. 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/QZPXF2120015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cfa83a5c5e5a2b10f2be3ca1b7099ddf1850030a67fdabb83d9388c1fb2542. 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/QZPXF2120019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d58d41df7a0b26758987dc0141f5976e441cecb2b90b64bc144dddfb33c238d. 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/QZPXF2120021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918ac41c6e64c4b3f45a16c866bd2c0522e1f2b70163518dc9539ce45d95267f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZN882154038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb775bf5465d416981c3f8d9f14f2cf27467d50d1c861bbb3e8adbbd7d86a65a7. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZZ662323654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33c20bc7f53d3162673fb793a37210db1fbc54fd5ff7aa1bb37aef50e174185. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZZ662434665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcc19c3cf3407f303e82bde486c836bd97ff99a2f3ce7678cfa39e6b87f7e47. 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/TCAIP2419522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14523de6a67972cc2ebaa0cf79312e8f0e78f0a807173621d148169151edd3a. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZS632446555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15b7cb0b7146fb47f0bc61372f9ce0009a6389108c653e9ac41a37457654a67. 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/QZDA41867950.