Cassandra Kouremenos, known professionally as Kallitechnis (stylised in all caps), is a Canadian musician from Montreal, Quebec, whose single "Gifted" received a Juno Award nomination for Contemporary
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 0x4719a6a7430988ec6a63a76284a5b2f5e7787623e8b2c52ddbaaf9a371bfbb25. 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/d3969539-a4c4-43e9-ac4d-81dde0594d9c.json and https://artists.proofprofile.net/proofs/artist/d3969539-a4c4-43e9-ac4d-81dde0594d9c.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 0x4ce29506554b3d9508fdffc632b6610abc0fc5dfaa5782b97861574c941ec2fc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM24S2105841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b839741819063e20358d211c43974a086495d84928999adb2d96a1e9d758fea. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CA5KR2152705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b10a0b6413504c8aa8a0296a293993b72be34480586ab98109ff3925af1ffe. 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/QM6MZ2494966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe0f02cd0fb2042167a088e38b611dd38d17fd3f4e699d58df9247663c51d36. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QMFMF2314231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9045fdee1bc9f4ea159fda4415c84fbf1e7290b59f94012256d69286a83b5638. 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/US23A1565002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675a8a6180746d4c2146bbd6b05494c085cccaa6cbabfafe7e484024b68169c9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBLFP2358768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9045fdee1bc9f4ea159fda4415c84fbf1e7290b59f94012256d69286a83b5638. 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/US23A1565002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9045fdee1bc9f4ea159fda4415c84fbf1e7290b59f94012256d69286a83b5638. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US23A1565002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97fa78af2d6eb20076f1097b1771452fdd0405def9201856191beda9cc8b7d5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMBZ92254419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859c73d7cce3f654004fcc605342ea5a1b5c43aa784493e84dd7d028dd36c24f. 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/CAOSK2200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb2daa65c35ed06d597f933b18e9444da6e719416874beb1772bb14a49e060f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM24S2202140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006ba40c2e6494dc70dc9dda93434970f46f6aa1c7ace3e7c625aab900745751. 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/USUYG1420020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7e2cb16dd20a4f00bcc5cc06b87a9170b391e1d1339fe07fc3af0e080a13f3. 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/QM24S2200212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4117526e334ef5fdd0f896223628440671e023487039db56150426ecd128d6f. 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/QM24S2105843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457b136b3ea247331edbe46b6e7d5e9fe3df1403216587e3f00e231fe30c477b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2162999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536017294b9b4897b4e59fe660d93a3f8b01f175c4b39709dc1e87369244703e. 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/QM24S2100667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfdee3972b0720268fb0415562e63238a3ef29df09761cb14ea4a54c747dfdb. 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/QM24S2100420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da960a92a44f7039aa56d5111f2c4476c6d4bb1654df34fd2fa4c82341699bc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM24S2008302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0384a18f4ee1ec4298a0bcbd51784eafe93d184bf548d5c7ae841c67e7af8d0. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QM24S2005635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b839741819063e20358d211c43974a086495d84928999adb2d96a1e9d758fea. 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/CA5KR2152705.