Femke () is a Dutch and West Frisian feminine given name of West Frisian origin. It means and is derived from the name Femme. Originally from Friesland, the name Femke started to spread beyond this r
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 0x05286bfeb759bbddfb097ab61dea2eb5cc0c0f502b58cd2aabdabf1f751cf91a. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c0df97b-d328-4403-8183-7281dbde3488.json and https://artists.proofprofile.net/proofs/artist/4c0df97b-d328-4403-8183-7281dbde3488.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 0x61ad23feabb6d57ad624cfe845533ea9dc13c70b5865a50182f703c5c85f7d97. 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/BE9HW2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcbc6b466bcaef60749bb454cd07c98f810af3d078e170414288f66dd42cee4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL8RL2330058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23cb3b33fdb16b36f5cb08d9a61cfd0b9fdce3726af3a2ef402523d1e14c6f5. 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/NL8RL2334196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb3f516bce8f59dccf9512bcc6479a3ecb71f58fae9beb59b25576fe5755e08. 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/NL8RL2404648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb3f516bce8f59dccf9512bcc6479a3ecb71f58fae9beb59b25576fe5755e08. 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/NL8RL2404648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fdcd26496fc7889858f43e89a6e87b2a179bbe0e89b499720332fabd1ac03b3. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:11:52Z), 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/QZTAW2233194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcbc6b466bcaef60749bb454cd07c98f810af3d078e170414288f66dd42cee4. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NL8RL2330058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7c7c659eb97fe8595a1fd590ea53acb3d74e005553e00a5b73552463b1bf53. 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/QZHN72399729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23cb3b33fdb16b36f5cb08d9a61cfd0b9fdce3726af3a2ef402523d1e14c6f5. 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/NL8RL2334196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de3db92cba0bcaec1cd8b1c45a7b26b8508d36520aaf7214b2fd8e788193510. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZWFG2480101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293617058c69bb12974d311d4bf8d0c2ec43e97f5b5b53fa7a9eaa4e2efa44e4. 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/QZWFX2407121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e207f2edf470c966cfd377be45e81fba3bcafa9079e2b8ed2b8d0994f62e9ba. 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/BEA031100002.