Roy Kafri (; born November 12, 1985) is an Israeli artist, comedian, and musician. His various projects have been well received on the web and have become viral hits. Kafri co-created with Niv Majar
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 0xaa00e80c4daa8903946e9caf87037cbac1902e79533f91919c2604f525807922. 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/daf57456-9229-4768-b277-ffb2ce86812a.json and https://artists.proofprofile.net/proofs/artist/daf57456-9229-4768-b277-ffb2ce86812a.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 0x0c3a1b5528356ea9d4385d3bf7fbbe3da92da2f4aaa7b1d2de8799d11d894e5e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCADO1836214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687aadd4c02a6979b1b09fcf98d950ebd453b3a1676604ee0f716dceac8f61e7. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:38:42Z), 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/TCADO1836215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa70915a4a4373b185750fd3367199b38483595b781808f0a2ad9ca488cf7fa6. 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/TCADO1836216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edba7bf56ead84affadc2f407e6fd99180a2446f1aa95cd91b7135c89173c49. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/TCADO1836219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907ebef74fbeb335f5931d3c7c601f664ba05f1bae013ce4f2a112eb924c7e4a. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCADO1836186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c4a0076577755fcc0b305e6e3ce0a4fd10e555709595598537270ca0f34ee5. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T20:03:23Z), 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/IL5842236922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef81e6c8f033fe33478c85bcef17ad5c885cfa51e682bfe5d2f02f5fe11fae82. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:07:11Z), 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/IL5842236923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb063f33e460bfcae50999fec9310a6f82149b7852a0576602c2e0d2d902f9c9d. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/IL7532313201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2be3886298d23849593a1dc282d707cba887aa0ce8796948eaddee88375dad. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/IL1042004803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015727f86fcad36b8825ee342ac758ced872a0fc40643b1100dd005d4fd8f46e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/IL6192305687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dd254442525bb593ea4eac635e42f9e052e78a45c203373053d94a304ceb69. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/IL1012000949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259810214578069b00ffdb6c51da60727b83131c7bf53d532091d80ef45a021e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IL7532212849.