Ivana Rašić Trmčić (, born on 12 October 1981), better known as Sajsi MC, is a Serbian rapper, singer and songwriter. Recognized as one of the most prominent female rappers in Serbia, her lyrics explo
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 0x4e21759c2411908c009ffe401d4b10b3b5892ce81bd5696f93d8d72b5d621cfc. 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/4494fd6d-7b71-4276-bfec-5c21dd6c521a.json and https://artists.proofprofile.net/proofs/artist/4494fd6d-7b71-4276-bfec-5c21dd6c521a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097fbe9740b832c9cb77dc833c12d4a27a4b29877d05ef7c5b5b7ff93289d524. 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/RSA222090442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc095beec7e4e5f4da4cdac650dc1a55b63e4b76a8e41c04f36c24126688962. 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/ATR981150176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37155ad119068a51be339655cf59afc7ef2ab6e1d6731b5001f7256020f49f02. 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/ATR981150177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a92a399364321a141d290984221f79097f65d5cc947e5d46811a50e16587da. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/RSZ141800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db8d2d3f427992fddeba360d92e27083a3e1370116c0fb4e7d2c1a9ede13c30. 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/RSA222100162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5aeb71f7e6b6ee54f5e467c7e20f6d5e5fecc45d30b4279924c1ccb58858fb7. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/RSZ142200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb730959420cec7f9630dd35f8ced525ca8b5dcb1edbbfdb14b085368f5fde79a. 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/RSZ142200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01afa48883aed5d0ff95b89581ff58a08cd07dae646d8a51fdfd61bdaf075b50. 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/RSZ142200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd327a126b6d555f8d6455a69e27ab8359e1c0ac91074b53732ce0dc78b2087ad. 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/RSA1X2400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5990ecbea8ed153b0939a10e7e1601d3bf46d205ef2ebec8146937c5d3065b0c. 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/RSA1X2400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20cd367d038da2102767b53bfef5d44cf39ae37c7c04a0f99a4818e0ef4096c3. 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/RSA1X2400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cd53bfcf1a1bca0485d7e5c3afee0285e7b6a31a7d3bbf082f4202aed0fe41. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/RSA1X2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f5628b6cc792795558a3d82f400a8d3ebff61dee55f60c9744ccf57ff95403. 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/RSA1X2400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ac8cd0b26f9784ab4a88a6d61e89a39841d7b81b0494d42e8f676dfd303d00. 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/RSA1X2400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac660e5b35b913330e3d9aebd04814103edf767ed58c88aaa86de160dd4f732e. 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/RSA1X2400107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6f8a57e15423f24741a1e884ba256a851158f225ce7858db4da4fdf9516f6e. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/RSA1X2400108.
Mater predstavlja: Starateljstvo (Deluxe Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877dad1f73494a5a310c37e4c759f797de47a2e568e52c324ab86dc8e3b1c7c0. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/RSA1X2500048.