Karl Felix Wilhelm Sandman (born 25 October 1998) is a Swedish singer and actor. He is best known as a member of the boy band FO&O with two studio albums Off the Grid (2014) and FO&O (2017). He plays
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 0xd75100eaa50985ddad542bd824e8b58cf284f6e644167f9b98978c3033234e73. 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/e356bfd3-f42c-4c0b-8c17-54d596c5996b.json and https://artists.proofprofile.net/proofs/artist/e356bfd3-f42c-4c0b-8c17-54d596c5996b.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 0x6de284868fb7679272de23450aa603e144394cec01bab8f1553e222a61784b93. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/SEWEE1801908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e772151c6df84581c6e24d382a7d2ae0ed6c816f88db2b39ca2b62291686239. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SEWEE1801903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c85b29b16c6edc64171994816403ab92d24350fdc4ea0472a6a4b456235bcd. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/SEWEE1801909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d117581b26585beb4fa5f49b9468165655bbc0d1d86168f01faa8b01b7b3071. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SEWEE1801904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096af0cb13f0e41ee5b1abb922ded79ad5e9022ff888674b1e5d9b8ca0270da8. 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/SEWEE1801905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f03c161b50b66904f0007dabc81be038e6bc911cbef4afdb486cbd42272d3c. 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/SEWEE1801601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf016608a92810f5ce70a27839f12278ee24fbe29f9cbd5d20f4e4927ad8e195c. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/SEWEE1801902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c339b4e07d63fa170f17a370c89006b8590e567c3fa249794487e7d36d9e964. 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/SEWEE1801907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4da055c3194500af535366caf052d09ccc40b791d3edd18451e7ddd621cbe7e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SEWEE1800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f03c161b50b66904f0007dabc81be038e6bc911cbef4afdb486cbd42272d3c. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/SEWEE1801601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4da055c3194500af535366caf052d09ccc40b791d3edd18451e7ddd621cbe7e. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SEWEE1800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5469902a0ddf04ee21c7e17860323d99a9d64fcdaf506a03cab38cca3cb9db5. 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/SEWEE2012701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13fc3be59c9435708f474f616864bb0b42aec4f379923ab4e72eddff689e711. 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/SEWEE1800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e3b944191e6e7fa03044b7ff49ba79ae2f865d2d2d17a724a4af0cf8fa30d8. 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/SEWEE1904301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2e96a2b00f26a8890435fdf68acf7b223a2d7e931204660a401e5246062031. 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/SEWEE1902301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932b64480fa7f4249cb2e2a53e5c90b5a5ff6e158a224e60d477e6d4ac60cb59. 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/SEWEE1900701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1171b0a9ee57630d762d31ee3a3f3cf1225b4fcb41a3fc20300fd80363d04706. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/SEWEE1900301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b474d4bff4715b70a505ae055a81484290549ef4b5485f07109a7b70c4e0d53. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEWEE1900302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ab49a9b3c2b1811b5a53d32c118777ec44671b084fc770270550bbba9c8a31. 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/SEWEE2005401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c09cf503d6e2768b006fc296a4712b659d61ae437d899e8158bfb768895334f. 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/SEWEE2007201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138d12055ca7f78572fd9110dfeef8ebaef86971f4e16a1b8b37c58156df1cdc. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/SEWEE2006501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdfd3700e37498a999f445381820ca373a3c36736838b9ad7cc9ce7c06ec448. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SEWEE2006601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce108b2df7564f636d839f062704e3c92fa4d8462d871821eeee959d0ec3945. 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/SEWEE2008201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a43b87702a3d0bb7361c7287e2f40046ec2b8ad7d0cefb28fea3917d868db7. 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/SEBGA2400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3487127bcae25d0d6c377d913fc7da4e88973bf4f554bbe8a5831035b59ab12b. 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/SEBGA2400231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a248314677775b7ff71e730838247f8ed29fdfe59ffafacbf17a7bc99fd58e0. 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/SEBGA2400673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae295757465b900fc983cf2e480138e48bbf55ba67015504a5135e45d9a7a36. 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/SEBGA2401660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a3702c3be798706b6cf9e9a923b54b5b3910a2702945947a5f6f2f2aa963b3. 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/SEBGA2400672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1efbdb851f05fa9a25fd58f8a4ac6340f7dd3dd8e4ecb73f7f58f200ba2b9e8. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/SEBGA2401662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a248314677775b7ff71e730838247f8ed29fdfe59ffafacbf17a7bc99fd58e0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SEBGA2400673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc485499b43ca0ad52d4206dbcd1723dfcf9b645646da8408fdf55b1592cad71c. 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/SEBGA2401663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d23dd52cd8c6ed8445850b3b1612b37d638fece2dbd85eed75bde2543ad76a0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SEBGA2401664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e35d4ea5b8fca7db089e83c5e2ea42ccb037a6488969a2ad76b3d5233cc24f. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/SEBGA2500082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6a51995f04456fef9573323510d9ebbbac222d549dd1c506cfe48cbe939f6e. 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/SEWEE1800801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c68c9eae6a8c3f99344b64ea933fbf8693238573fad9dda21c438556c2c357. 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/NOUM71900125.