thumb|alt=Friedland, 1968. Boris Carmi, Meitar collection, National Library of Israel.|Friedland, 1968. Boris Carmi, Meitar collection, National Library of Israel. Dalia Friedland (; born 13 February
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 0x85587d342ae5d2794ddd011a9ee9a9df302cd482240f7719dce3774cec0b3401. 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/dd8a15fc-853d-48f7-a11c-351226556d03.json and https://artists.proofprofile.net/proofs/artist/dd8a15fc-853d-48f7-a11c-351226556d03.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 0x1800346447bf80275a00d225f7b384ea3ab04e609db10485204a9b4ebee5bfb1. 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/IL1010001908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021c28e7d72362f459e7cc42b51dcb6d6add52484d28d46add65bd2e1506a117. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/IL1010002002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1df2da0dd1675bf403a164cad0b28a822ae1ee81e25d598e3049cb045612288. 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/IL1010004880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f4940505ace0a2c2d7681dfa58973862a9c01b8d01bb7d4c30229974fc083b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/IL1010000347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b05f269756d8ac7c2cd3a17794241adb56d6b8c4cba6b81df683256feb9dd9. 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/IL1010001774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed20d924207fabceb7bf84864b267a91dbf2d5d27b75104cb9510fed573c522. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:39:13Z), 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/IL1010005349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5371d13c42460282a75d918babc250e71a1ad145355cbf65122ff9ca513e6a. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/IL1010100981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b3a927982e5f6067fceb0a72b89e1772f4799d8b1aed979a691f5a411afb5c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/IL1010003791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3bcdf38ec9de6e47e89dd3606d8924ded5cd84b7aac72f800f48815cbc476f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/IL1010004933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286ddba6d97d20452dcd846f0ccf747ffc5f759633b00c28dfe6bad04d1bfef1. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/IL1010002404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3287fd3ecf049fc6ef0dfeecb79b8d24a9a3d1f5bc1cc3d45deca37499423bd. 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/IL1010003147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f74aefde8a57a533378f55e3cb1ab4a6eb04649c24144627c1ba5d3253183c0. 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/IL1011800366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2676c097a73c877af4f2e255536ddc11481187c06ca14738405b7fd724522d3. 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/IL1011097949.