Ostava is an alternative rock band from Bulgaria. It was formed in 1991, and released a long-playing record in 2000. History Formation and early years thumb|233px| Fender Jazz Bass played by Boya
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 0x9ed912c6cb5419f52ba79adda07a72e9a553991a9aa188c1df7030b3c844c347. 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/638a45a3-25c5-4a87-90d7-504ab47ee6d1.json and https://artists.proofprofile.net/proofs/artist/638a45a3-25c5-4a87-90d7-504ab47ee6d1.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 0x2893cf788e4cc1b2573ca29cfe25712d9afc4f066478a75382eef5bf3d9550cc. 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/BGA260817701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822513107db2d487a02abe35a2432f4ecd5bdb2661640e09d6cbddec87f895f1. 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/BGA260817703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7086c1154b7cf57af6b64e10f008d1c51496c69b872791d7e4118d707a3f2c. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/BGA260817704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2426e86e63a29ed802dad7d1af66ae878e84ca067f116713f84027a4f877b435. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/BGA260817709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039c03e09da88b0af493b7537082ee5f884637ef5a84de74c80a343db0eff3bc. 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/USA560827965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd09925a65c0b4955a01a8d8b50981f0f8df259b48d07c52a39d6b4ff7f4122. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/USA560827966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0901e624a7a278cc65aa1eed68669bcab4aee6556fa0a8d344e039c6c946213. 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/USA560827967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f026dfc3d7cd847c8685fe9f2d37379d1e7236305251ae1069688e76168589. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/BGA471533342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad35694a07cd160fce49b871ed103ea4fd8d420f581ec0ab63ff32144d6a0500. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/BGA471533344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b347b15311aa7d6b8d73a6714f9a42c27739d353ef0f2254a53361fdb5a9bb. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/BGA471533345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a1082ce8264863f2a6b9146e1f219c06a7b0d164855a11db81adba408cc994. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/BGA472217588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d57f32c8b193af5a2c2a2913effe6ac5a04daf8490c9373be434bb7f528bc6. 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/BGA472209337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b7235655886627cab79797a246894832948f0a5dda72dcd2af385ab82d396c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/BGA472217589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05682ca1673d655b68565816a5603fa340c83ef2ccc92a2df2637fa4cb5cf3d. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/BGA472217593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe462abfd863c87d3357afdd09de9272a35c8ade00fb73d1caef4e6fa2aee15da. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BGA472217595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99b9f791ed2f89b19db6bf759904a3737a45c606b5a23b59660c04d83474a4b. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/BGA472217596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70732003ec25f18630f88e7a39095b56357591fe910c650902c4bb710f551ae5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DGA0H2402365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ab2b00eba6c7667be6b918d7c3051ada8a0c8d7da4ebca1ba7694b812518fc. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/FR2X42526023.