Firma may refer to: Firma, Missouri, a ghost town in the United States Firma (supporter group), a Serbian football fan club Firma, a monthly magazine supplement to the Globes (newspaper) newspaper Fi
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 0xa9bbc49035ae0817ce4ab90cb631eae40d363a6acf9ddd0b237addf45694c70a. 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/ed9648db-5529-4d38-873e-58d47b40fff3.json and https://artists.proofprofile.net/proofs/artist/ed9648db-5529-4d38-873e-58d47b40fff3.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 0x9d193001c6a8e01f371f2ff51cb4d1cd11835ee9e4565ca9cf2d9ceace9a1137. 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/USA370666984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe912e02d15ef23310d0aa1ca7dfa7c93a1c3513ada2c79d89ec107ced36abcda. 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/ROCRP0700244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588a2b2ebea9466f26fc8473e0a88430793af18aa06ae89fe8971956cddcb8ca. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ROCRP0700245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44deca80ec62c2dec819446ac0b8dd67a49075d728b431bf96e5e1008697a427. 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/ROCRP0700250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ac7f0a59ac3aba95ce7282ea9760f3b9b7648f79e1f04cf67b2b474aadb0eb. 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/ROCRP0700251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd9c9398c63f28bda95cebce7cc7faba901f9672b0377790886f04fcc59d8a3. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZES61841892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7459680076cc815e42711f188567c6b40265bd17509260421a11fc7746c940. 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/QZES61841895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe5316ad81c08664e2ee41225705a42f35abe26d8240303c2ede0e5edd0d418. 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/QZES61841898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545ae19622760564e9364d42bdd46ab933c9772ee023d0c9b85cc72429d91b71. 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/QZES61841901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283b54e6c58d0552415277d74a064b216a0112959af0c436519c2853675bef3e. 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/QZES61841467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf760b17e77a6013bcb5d2267396787b4710c3bc6e657a03eeeed24f206e301a7. 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/QZES61841471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7319e4b61510df0c578cede71c117d29a89ed601b4315f339b9124033ee491d0. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZES61841472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d987a91d9b70506438484186728b6da7e7ae7b07f6f2a25bc7f22b7600664d2. 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/QZES61841473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb55d87c54b3d8184463a8a8abaa324eb0980eaae5737f63835255babc3945ec. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZES61895917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90bfd54074e2f3e5f9077040eae3c29b22913410121fc719e4c364ba6cbb8cb. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZES61895922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0246c86187867f89e4301a805febcd2a532e284cfc12f61cb2f90e518a823d. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZMEP2017984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46eafa6fa519acd62cd4259b187d28fcd6d0fdf8a217afc7fcba7eecb1ddd75. 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/QZES82184879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4eb9807dc97e73d9670be923f3ba76dc2407bc93db1187cf35fd80cac7936a5. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/RSA221820139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9baf8078c9ae419a1d01ea0d608d4937a4fcb6551a992fe4eff63e1db2d9fc51. 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/PLE951200958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15ed81d97bef0c182463ee5d8195f62ac4a199fc234346772e473e2157cffa3. 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/PLJ921700219.