De Havenzangers were a Dutch musical group who had significant commercial success singing popular music in Dutch. They were founded in Apeldoorn in 1977, and had their first big hit with "'s Nachts na
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 0x97432b32714a41ebe372fab811d4747d4c5fdeab3cd7582796fb3818604f453e. 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/626f4393-c69a-43a5-9b40-6ebea3f3b466.json and https://artists.proofprofile.net/proofs/artist/626f4393-c69a-43a5-9b40-6ebea3f3b466.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 0x562e8f6c066fb04ab65f20dd2b6148ff592efe550a9d6dce497841f57efb7df8. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLA307900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01759b587269e3b7f0ac65c38e50af3aa2d6d5aca6ae81388a793760d91963a6. 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/NLA300400253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784ee0510e7f24f8d4583660c062f1898b7639c126abf0b6352dc1c15c69269f. 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/NLZ781100267.
Trouw Niet Voor Je veertig bent/ De Bostella/ Parijs heeft mooie Vrouwen/ Geef Mij maar Amsterdam/ `n Pikketanussie....
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d5950d3c40068957dbbaee3fbb1c6cd3b3e2427fe8a809f8eeaf67117c5323. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/NLZ781100313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ed694ba34d3227d6bfc9b9ff030baa3589445b2b8b557f222d49cbcc5e802d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/NLA308400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a9a280a3b90df69fc176aa0ec3160d9ed311329cf48300ab154fea061ecf7a. 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/NLD130021148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18df565cf083b59ec8fee346fde04641361d5a6d998431a5ffd4b2cc22f5cace. 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/NLA240000046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340568deb7724ba95782f0e4704ad0180160ea8f291ceda18a2c2be6a40b08f9. 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/NLA240000361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5837dcdf53b57eaa876ec5c6596c21f6888cc6cd63a6ee3fc6a3c8d81246751a. 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/NLA240000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5ea98e11ee121d12e656515690126146a1aa91f9f09a891785821ba51429fe. 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/NLA240300160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf852c247241fcd8448b90edafe1b3dc1243cd9173fff3484b7c8cf8db84eca. 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/NLA300800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18df565cf083b59ec8fee346fde04641361d5a6d998431a5ffd4b2cc22f5cace. 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/NLA240000046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236b31085429af3534c45677a53f636e1d79a19ade657e9effa80ef67f4d55f5. 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/NLA240000051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7055cc71ff6e4a4f627304da1efed21e65596e0e8495502c8ca4bdf85baf5b. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NLA240000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5837dcdf53b57eaa876ec5c6596c21f6888cc6cd63a6ee3fc6a3c8d81246751a. 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/NLA240000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1881c0cd13cac8de31a749c47dd1a9e8b49deca45d57fb9466ca4463c14eefe. 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/NLA240000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340568deb7724ba95782f0e4704ad0180160ea8f291ceda18a2c2be6a40b08f9. 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/NLA240000361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e31a738bc9a3746bfc1e2c102d00ebcd00d189b6e6cf8b06f8534bbd58e5a98. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLA240000045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381b4c59856883894425ebcb00ae123cad1daf71b63317b51937db9726618db8. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLA240300602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0056c3b0f8ab24f201b5276d2e2d611cdbea0807e3f2e1ba1142b7923510494. 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/NLA240000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f4dcbf9b10218f8ac05969843ac3b8de8740d3738f4eaacfc222934fae1967. 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/NLA308700033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ee3906d7cc422d2d63df483236469fa579bbeca3b42cb8c96fb644798ec065. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLA240300249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a605ff7622daa352040e17995d19ed8066506a3f70a6906fe83a9896f204e1. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLA240300163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d9571d8e7c87b4ec303cde33cc35bc7122c539c0c082a87696c40f0153a9cf. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLA240000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fb8f9938d8892cc78c95d02c9a38643fdc6cd719e5cf90b0e334d9360f2661. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLA240300608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93db87f5b08c5aa8ae5b225bdf89ec1a55f1be69c87d69c2f656257cfc315b13. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/NLA240300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d2469bbcd39a3b5df393fe5abb22d012efa114a59fc13b4644c05d1541c25be. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLA240300610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6361a173054b4e48fa9965ea452f1753384558bd649e9eb98f459cb9ad6e0ba. 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/NLW2R1712537.
Och was ik maar bij moeder thuis gebleven
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af300de9e844281f00cd1d2f45cb8a47cdc32907b19839e8de3382e502ab550. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLW2R1712545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cf326cd7d236930876cc13531838be1f4ef078de985f7df74d874e1ef9224c. 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/NLA240300168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b862b08577bd9dddbb98be4bee0cd8a72a757be3e02f8ee2de35fcc6f486c49. 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/NLA241800131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5c1f0ac690c1045ad368f7400da5a6f8963f6d429b7c31d9336fa5473f6b99. 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/NLS241202836.