thumb|Rotem Sivan performing in Kraków, Poland Rotem Sivan (Hebrew: רותם סיון; born in Jerusalem, Israel) is a jazz guitarist and composer living in New York City.Greaves, Anthony, "Rotem Sivan: Jazz
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 0xef3f77e0c1f2e63610b8c480eaadcb6a6c96ac80537f55f1d61ef29816fe25fb. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bb3fca8-25ed-499b-b3ca-271471230b4f.json and https://artists.proofprofile.net/proofs/artist/1bb3fca8-25ed-499b-b3ca-271471230b4f.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 0x3a6fee57c8a1ef8345c59794eb138ddd498f8576eab15662f069ee7973279d8b. 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/QM24S2106039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf303435602718dd06bc755424e959ec790c8b5f65993de37f9fedc4c60ff29. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QM24S2104656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4cbb6b8e5aa1aad6f99feb74d0d64641f4d0ae344debf1a757c9f194fb67f6. 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/QM24S2105690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9bd8cb10f2e6c2370805ea48bd50e270157ecfd3791b8c0eafd3a3a8ec7145. 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/QM24S2205762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2818912edb8ecf658a77f5f99f25c1eab6e6437414848b6705e8dbd13de90830. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QM24S2300698.
Belladonna Blue & There She Goes (Reworks)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2f1553a7fed2ad6596a657b0aef95f01f5af7fd77f526596daa558f761b8be. 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/QM24S2304559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043694161f3c9cd5af881192196f897d13c1ce952df317903bf02513b5efaf28. 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/QM24S2402373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3780abe9f6419919edbe9cbf446e7924dcb16d24e0e74abb9f2e9cbadac9886. 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/QM24S2402371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ecf253e8fa505c6d4676544766ae2cd78c7fb7c9991409cd9ee3a040225664d. 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/QM24S2502576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4223bf8d84ed1c48f00f8b9edc086b6c44480817287a74e2c870f0b6b0cd7b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:26:51Z), 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/QM24S2502584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43b27336ae4a0104c2492d3501526b90db5500c2749b99b8dc00f22013c027f. 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/QM24S2400608.