Alexander Serge de Buisonjé (born 19 July 1973) is a Dutch singer who performs in Dutch and English. He is also a TV presenter best known for presenting Vrienden van Amstel LIVE! (2010) and Vrienden v
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 0x750c9f095f2a08557f7791e0a3d8ebe0e36fb517cf5d2b81d802cff46ea68506. 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/33bc0962-772e-4b1b-ab4a-443ea1bf8238.json and https://artists.proofprofile.net/proofs/artist/33bc0962-772e-4b1b-ab4a-443ea1bf8238.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 0x24846f7fa06c574930fa71ff18fbaf795c134fe9b2f21c2a4207a0b4e162011d. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/NLA200400194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d6bb0d1f150cd4d4838f618b26ce1f6343c5ff4b34f3075db3c47a0c2367ec. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/NLA200400197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409fdfbc8e7937ea9869dafdd8d695f01d8e60962979c6bab2112c1a0a827e57. 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/NLP760500165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373d9b7ddfb84dbed374921f3755c9c08f14a207c568207ea7ec067be57e1aa0. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NLQU21100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012f2c18800bac727c76b250e3a7a78fd4780cb9e18b8e09ee8e13bb2830ec05. 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/NLVC41200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53acb061e2e137eba5a2fb8499b257fc171c58e6afe602d2d4a5a60b206c701. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/NLVC41200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb705ca122bbc85a91e5ca4cd2a1817e0ec94732fc58f1acd009fa717238c92f. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/NLVC41200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eff29ddcf946bcd9f8d8e83147998f9f9d10dc4016986065bd7ef3ccff524b0. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/NLVC41200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f5ea4f2901c9d0f075185c285aae38c3ffd17a8b1c73ce490aa7a33b23f7a3. 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/NLVC41500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c50b1b91924bd40c4aa2ee39f8251f3e1cf21bf0f04814ae609cb8b7ded539c. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/NLVC41600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e4304cc86b1caef90543babb230382e3628630b76182e0cb0dacba7b1086bb. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/NLVC41600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd638c060048a489c4f535e49115e60589f80beb3fe36dbb0b23c4d62d5b1af13. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLA6A1800315.
De Nacht Is Mijn Leven (Holland Zingt Hazes 2018)
Het Beste van de Beste Zangers van Nederland (Deel 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305d16f07f188c32661cbc1022a52fd7b040185afb20c9cb125e8066f98c519f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLSU31100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cb2c7147d6492a50b98e9d5ea24d286329037f86b54bf6a8f88e9a99f1b072. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/NLD431500046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c27fa54eff1f688784d1f1b1a1e1f17ff5ed704c459bc48ffbfe38ff84d2f1. 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/NLA270700473.