Fero or Feró is a given name and family name, and may refer to: Given name Fero Fero is a nickname for Ferario and František: Ferario Spasov (born 1962), Bulgarian football coach and manager Fer
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 0xd3553bfd3b9bd84db5ccd8cd396727b6a79689caefcfa29e7707aa00701d20bc. 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/75f5b5e4-47be-483b-b1ae-a80fc53500f0.json and https://artists.proofprofile.net/proofs/artist/75f5b5e4-47be-483b-b1ae-a80fc53500f0.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 0x049821e2b2dc5c080ebea86de701031b31c7ffa37dd9edc836baf728def91d79. 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/XKA001700052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953897ca5970513e0dd84751a258c2abfd13e61496a85af146be8a7e9b156662. 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/XKA001700061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441886be1df124b2c4a3e965029a6ac1e201a5711431639ef32bc4fc8a49db46. 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/XKA001900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97f5a874bbbfeb50f8bd8ad361cdca872cb006055ef601e1efc86fb619f97c2. 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/GX7852500706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9faeb50e2a0b8f302a96e62367371faa41c828cb225ba3bf1d5ae50eacd6b14. 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/DETV91501475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6664e4f1c9c2cd49fa31bdb8595ab552b56b04ee017b9c3d84d50145156f8c. 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/DETV91501480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb11cdd5efa98c0e3b91adf51145dbda34327c68014b80148f4b920004cc9c7f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DETV91501486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49f68d17b5facf214502212fad2364b20bd623a47a291a7ecee8638be0e8da7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DETV91501517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e8f3cf05f9a6ba6777c3b8f587ae0bcc15909a7310bee82faa62dc87bd1cf4. 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/TCAEZ2016606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d78bc1f0982ef29003907bb9129a1d139bab0ebdc25969d24b28182d81c10e. 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/GBSMU9265449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472a2e6f02cc10002517e1b298332c667876f9d469eefae982a43b635d46944e. 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/GBSMU9595184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6503f7c6321010d902b397e2f191df19912d58d29cf789dcbd7884d339e482b. 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/GBSMU9691176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1ebb866730fd657e7fbff260e3898a5a45a65b58b3297e903a7b1ec143bbb1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ32249322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e321a4cd4d7dccf910fef7495aa23ec9d5621e14ad09e96dc94b71c0c66f990. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZFZ32249325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2557f6fc865d01ee7ca3a9840eac42f11036ef3f413904bef0cc84719ecd618a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFZ32249326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f33fdbd078faaa33ffb104bd556f83f9ac7d0ec6167e18e0106109f237463b. 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/QZFZ32249328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48ff8e7ed87d5d27127eef33b72fc19f4eb60865a0d55b5c690bfec2f699b27. 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/QZFZ32249329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5250763173ab088730bfcffd9de93fa97f0eff72ca28719910b831a4cffed4e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZFZ32249330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f403dfe4297746ebbecd9a4984b5c1b1b0ef60f7a876f9382bd20ff84a0bd2. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZAKB2345608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b4b7a6569fccd2001a0b8d4e5cf5510f4753a8edb546725cca96ca20687d16. 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/QZAKB2353245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e8ece474c9afff0b08d739763f0808b8a0bd98d12197c978d5999b949427dd. 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/QZAKB2353246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b674c7327b53fb4961f2f95f87c65293ad67e55256cb02d68bb6da7eb59753. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZAKB2343528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a34e816069d236c15ac1ba782529015ae9aed059b666f8b734f9b55217d3c9. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ESA012469937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d99c003d358c136db24bee2a6ad361414ebf85742bda650b067e0dff5bbaeb0. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/ESA012496461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc3883b3385e99172155909da344e2db895c03135d99e314fc52d5424817e5d. 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/ESA012496460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c00692dd2e1194a93b4a47112491936702033e90380c8a18dc607256e632b3. 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/ESA012496468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca56cf71bbc86d04c7fad37be66b055db639f621c481b3d80b381d85c2a8e5f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ESA012567726.