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 0x1c5cd64fbc7036e062678d28338b56493cb40641e1f4fb45ddd0338d1a0372d6. 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/999b2959-c9c6-4dec-b1d5-c0ee0cc0fac0.json and https://artists.proofprofile.net/proofs/artist/999b2959-c9c6-4dec-b1d5-c0ee0cc0fac0.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 0x15c36e4c953350f9490cb2561ae2f38e6b8822a0bf24c679cc12e70521f29d37. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:32:32Z), 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/USZDV0910116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5be5a9d347c29a9ff3ec765f7243bd23d69be59a384c622cba6773ea5e64e14. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/USZDV0910118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd86a22b24eab31fd3b8812bbd946fdd97b574f2813b8527aeacb4cbb6067ec. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T09:52:03Z), 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/USZDV1100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7886086233d9e1af780eecd9c7c778b1f1edc12bff7cb67659db0635128d1e. 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/USZDV1100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf280548e94aaf3fab92cb06000bb4d84c9df3854ccb3c6d8ecd22d5ec9da0dbf. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:38:38Z), 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/USX9P1252001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff5e0332b6f1878db1dd96dd1d84eed408a48e557392db064b3bbbf3b7707eb. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USCGH1358938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55591415a45bf51032b7faa6de63a284fb64ad5cd9ffc1079dd4345b22981829. 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/USZDV1300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238a544e22cfc12e0bef2ce7179d488bfa1bf217efcbb95be744ecdfdef13239. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/USZDV1300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160777bd29bff583eb4fa7b975bc1033f6cea99d9ce3f32fa68fddf11fa3db2b. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/USHM81400175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0bea3bb14ea6a47cd3f5e4f189c46edb720c23dfc126ba74148ecb03820e0b4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USCGH1625091.
The Pit of Despair and the Joy of the Trampoline
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06bf01c31da9c080bc3d07a28dc67d27dde537278f338c3e783dfd882d071ca. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USHM81628193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8718a9c3861f2be6fdc40619ad4db658cd1785318f03b12ac71a91e556bfb3b. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USHM81628196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0985e18f8c2b16a3146eaed7ec76295546fd49047bc290f8edc76d58dae1c4f8. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USHM81628205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e15b7a39b2da76283c9eae593719fc7d4f1f16a843b5b9a436e5488c55eeeb6. 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/USDY41997034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd59d0cecc8b5c0380c2731e06c7a2afa7b8268dedb5235d21274446fd648153. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:41:07Z), 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/USDY41997037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b456c12dd3b20c1d0dc4748371e6936d72170675318688cd8ff0c0e490bf37f. 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/USL4Q2162156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb7671dc35236413e4b405ff4557bdfc8ca6613eed1c6fe8037ab531e92886e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USY242437810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784292b7eaa5e8704d2a7211279287b3c7b404d125aa43dfe9bf2f9ef591dc49. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:17:25Z), 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/USCGJ2507482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47043f8d53024d0e3142984dd9c8ce1341b4c1868e9863e662ab041d49d400d3. 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/USHM22513658.