thumb|Tol Hansse Tol Hansse (born Johannes Adrianus "Hans" van Tol, 3 April 1940, Laren - 29 April 2002) was a Dutch singer and musician. He was the son of cabaret artist . Because of his father's his
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 0x78f6f81e420722477442516b375ef40a09dbcf5ce3acdff2600d7d32266fe25b. 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/36bac192-8e64-46b3-bf33-f5e7ad1fd5d8.json and https://artists.proofprofile.net/proofs/artist/36bac192-8e64-46b3-bf33-f5e7ad1fd5d8.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 0x4ab9168d2c6fae8bd90dfac07d8c8d08a646a1429b16e3ee91a1dc0ddd595999. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLC282100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c38ab5b3aaf50103878570a77c0d82e40b295f9a6ee7ad9081ff01502e52aa. 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/NLC282100111.
Ha, Ha, Ha, Ik Lach Me Dood (Remastered)
't Is Me Het Stille Nachtje Wel (Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cfa0ca7014a117b806e69da22f45a0c4194a3ccc5d2ca64578787410ebeeb9. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:56:05Z), 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/NLC287800120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ec69643ab502674ef7ef6765989806303e699c56126ce7ce2bf616bdfb25fb. 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/NLC287800122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9e134ec452323569601f869cd6a1ce705c2764de8289a997d338d80cad8713. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/NLC287800125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d11df9ff5e25da024c8f294ad0a9c71386b912a0787d0aea3b8c234d8d293b2. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/NLC287800124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6d553e4763f1094e1967f482920e1ec45b22a5b97e4bcf6a0c0d26f759548f. 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/NLC287800057.