Thomas Acda (born Amsterdam, 6 March 1967) is a Dutch singer, actor and comedian, known as a member of the duo Acda en De Munnik. Acda grew up in De Rijp. After graduating high school at havo level,
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 0x2a379ef8348d144fd8de0534e5f2ff2ffcdb1c5ffbde5c765e65b928a5f193ff. 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/49a146e3-f895-429c-82f1-0bd7e5f23577.json and https://artists.proofprofile.net/proofs/artist/49a146e3-f895-429c-82f1-0bd7e5f23577.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
De Marathon (Titelsong van de gelijknamige Musical)
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 0x14c23e375b0a0f97f413ace9da4b5b180a37186fef706264d1db28d6a3193b98. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLC5E1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20bf26335a9715139947dbcb24dd518c4abc9bd1593fd6066b9f0ac8321ae0dd. 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/NLC5E1600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b650ae555cf5f88bd96f1b0e7d5207cc7923c0226f020b2dd8cf9c44b89465. 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/NLC5E1600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fd0ff9be9ef8918f7abb0b11ed751ecf5f303c80022d90c6f3b0a428bf2381. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US3F71910614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031e2af73dc79f5aa3588427358ce1672fe4415b0402092a408bc61c7c3ff4a0. 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/US3F71910615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4410fe46cdc199cfd4d4453cc85888bd61ad0e424a230b8be7769e910bc8a74d. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/US3F71910629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde76104c71d0fd6070607ac36aff323ebeab75b25622d3eae73e13f8dea1c47. 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/NL2QQ2000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa593b2a6446eeb8d72d5fdf0d6b3e8b9b812cb10175c40a288879141167458b8. 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/NLK072000163.
Kom Zitten En Ga Met Mij Mee (Officiële Soundtrack Berend Botje Het Mysterie Van Het Ei)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abf7658c2c42ca6b06e427313e1b75ea8b258c07cd977c30c38e5925324ffce. 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/NLK072200023.
Hollandse Hits - Top 100 (Beste Aller Tijden)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a388cf05aaad45af96655acb4ae9c4794cd2be7270cea6f0921b8a46eeb439. 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/NLH591100122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a60ce38dfdfa9630b62698a07c7553d8afc53c0ac6577ffb3dde25ad5fdf10. 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/NLS242300318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a60ce38dfdfa9630b62698a07c7553d8afc53c0ac6577ffb3dde25ad5fdf10. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLS242300318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45019a331f071360af8880d93925624aa53b5969bd3c03dda6549a25c2f3001d. 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/NLR1T2000175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45019a331f071360af8880d93925624aa53b5969bd3c03dda6549a25c2f3001d. 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/NLR1T2000175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45019a331f071360af8880d93925624aa53b5969bd3c03dda6549a25c2f3001d. 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/NLR1T2000175.
Reünie - Live op De Vrienden van Amstel LIVE
Reünie (Live op De Vrienden van Amstel LIVE)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf071571e152e75a0dc307afcd346ac29e109554fec14f82678f76ad317c7b694. 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/NLR1T2000011.
Ik Leef Niet Meer Voor Jou / Cervo A Primavera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7191dbedf8d37eb71234f8e706b9da185ff3567ec03e8f20aa5b3a4815b0ea. 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/NLUM71600633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c98d35f5e39f5d978791bc84bdc2a700169eca6d2f7b7ae3345ae2e7332c195. 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/NLUM71600635.