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 0x4feb6c22bea3e34d3f27e6039b163006a6bea09b6a045594cb0a7d14ffc4328b. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27af6dc6-3da8-40f2-869c-5d59cab46af4.json and https://artists.proofprofile.net/proofs/artist/27af6dc6-3da8-40f2-869c-5d59cab46af4.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 0xe169e6b577f837bffb55eb8d6f5e6f27ef35842bc116d08896b381b4057634c0. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZFZ72515812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce6dea64b575531c4cd8dd4a3895f5fdd12ebca234a94947becc14f20517cbe. 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/QT3F22423901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb99ac10c8df57d7b85627d4873e35b0aba4f62cf22f6ba46461daf79a7f2be8. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QT3F22423902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6b9f4e6f8c53a351304e21381e9017e2b1dcfd674e8abb3ae8c114603184cb. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QT3F22423903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a6f0c515d710eefae403115fd0b81dacffc197c834d0322cf77d3674baea3a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7N2579700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f1c349dce9abc3c60a6f26b643e1b8649d045747c1491226ec58ce9b7af289. 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/QZZ7N2579701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaccd476bb1d116c6369f3641f01feb8a468050ae5031f3eb4868cd622c2e0b6. 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/QZZ7N2579702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39cd421bb258dbdbb954c373ffcf15d9939688415a29baaa93219fbf27cd0ae. 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/QZZ7N2579703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c084506b362e9a4ce6068a61f3d3cc6a71584d8fc396d692f8425cbdd55a18a. 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/QZZ7N2579704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772a726734e9f5b55af2ccb905b408f73d184a51d3b56f60188576c0b7499bc8. 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/QZZ7N2579705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0165abf2072b17435bbca8a84665231a71dc99c670e0fb36434556607098afa. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7N2579706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50139ba445431003af4f4715b29bbc2f7124fc264c0083de6c10dc7f02af1d6. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZMER2535045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca786e801686810897e4658e745b4172d5088f882eb1319c65b6ed29bb7faa17. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZZ7N2579707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c5d930c8f0e8d2d9d3b00e6d0384833844800e52e7d2772996291d5b2fa93a. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7N2579708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e49203a6fc5de3533f005a8cdb1f9ada47e1cbf6d9b1efbd4d269707bc50a6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7N2579709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c916fc8f71e010b4b070fcdf46a8567d87e77b0efe5b9be17b01d6c1bf81cd. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT3F22593847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b5953970fad3cad19db70991e42116d304c568580de0cc8fd5eebdea4620dc. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QT3F22593848.