Branko Mataja (25 November 1923 – 9 September 2000) was a Yugoslav–American folk and blues musician. Early life left|thumb|268x268px|Clipping from a newspaper with an advertisement for Traditional F
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f7c2b1fb0d990b8499235710cf50381197d6b47888c0ce4008d423069c0e9d. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b94c559a-f3e9-4ba5-8c26-58f4ec7e74ec.json and https://artists.proofprofile.net/proofs/artist/b94c559a-f3e9-4ba5-8c26-58f4ec7e74ec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Traditional And Folk Songs Of Yugoslavia
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d4abe5e33b70fc19716f9383337242cb513ff3d3d3faeb17d702d66be51eaf. 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/USCW62208204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0d02e0bbfc62b5c7a125267bd1d6269ad5184b4e6f87a8f8844e3f96ce45f8. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/USCW62224005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b3e69590cbc3d2b6bfe3a5f8ce1cd5ee6ff7be326380d10be5c68a8499b3cf. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/USCW62224006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe363509fc666d0d580056e3ac94b291d057e4caa0f83d00df8968241ebc3b95c. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/USCW62208203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d435b34e0aee5c3457ca5984ea742436de347ec74383b637e9e77fcedd6fe5. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/USCW62224008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bd4fd33c8f527e989dc6464a01c4f455952fd0f69c2d525cd15f379a6abd0d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USCW62208205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c56c8c6eab1dc19603f233fc49b82453f4bc9893a32869d787a16a036a9fabb. 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/USCW62224011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff031198ca000c3468f89ea448b6f68ac840f3ff5ba12b37f69254cfe06614c7. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USCW62208212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca55a9f08df8fc6b660d200b5a03ebb0ad2d879922d678cfe40e0461d34aef7c. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USCW62208206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494bcd5c75a953d908d7ade09f79a0713915f3ef7c251a77db877365420c1cbe. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USCW62208201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57525d4055877c97b12a924614bd63f33d66414a65e03c57fba4ed986cb8090f. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/USCW62208202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe363509fc666d0d580056e3ac94b291d057e4caa0f83d00df8968241ebc3b95c. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/USCW62208203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d4abe5e33b70fc19716f9383337242cb513ff3d3d3faeb17d702d66be51eaf. 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/USCW62208204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bd4fd33c8f527e989dc6464a01c4f455952fd0f69c2d525cd15f379a6abd0d. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:37:42Z), 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/USCW62208205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca55a9f08df8fc6b660d200b5a03ebb0ad2d879922d678cfe40e0461d34aef7c. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USCW62208206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0e1d32bdcb5ef314fb17e1f701f9cdace796f731bdf584ec442cc5523ef184. 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/USCW62208208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c71d5413672e762436c0c40bd6cbdc2f4f75f425b222f153d8b473f3f138e1. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/USCW62208209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c26cd5bb561b184be2031bcc59e0caf202402a6e16e06647b1865a45b6df40. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USCW62208210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b14c475b5186f2507bb3172b2c4bda29238ef6f89e096caf81881b7734e41c8. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/USCW62208211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff031198ca000c3468f89ea448b6f68ac840f3ff5ba12b37f69254cfe06614c7. 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/USCW62208212.