Slagter is a Dutch surname literally meaning butcher. Notable people with the surname include: Carolina Slagter (born 1994), Dutch water polo player Tom-Jelte Slagter (born 1989), Dutch cyclist See
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 0xd8b4702a87ad34f7e1c523a21c25f13c7014e4cd2352bae9a195f72cf0fc237e. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99cbd9ae-d4dc-48fd-a00f-d77d8da5a99c.json and https://artists.proofprofile.net/proofs/artist/99cbd9ae-d4dc-48fd-a00f-d77d8da5a99c.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 0x30adfc75088dab2424dd612a7b5787485b425f54cf68595bcbdf967183735a8e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLZ7B2200248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6498b76fcbe294257102361ba8d2bc15784a0bc7344298e4ad2fb9ac9364e09. 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/NLZ7B2200249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e3cdf59cf35c75da99db9925e3e23de644417fca68817a819c590a1e21f0ae. 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/NLZ7B2200250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3319873e64f38cc9f5864985f0628169b281135e941db846475033e1ab90f98. 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/NLZ7B2200251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad7d0e8176c106c6264fdca8c78981815b60a4b3a5bd1611c38b06b54952fd0. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLZ7B2200252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9ca580678e3ed2d4e2d093ed9fda4cf32e3934747c2d8eb31cf26f9e742565. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLZ7B2200253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0352d37b806ac66e92968b2c235420c4476a40af6eacc4b0372e8b9ff3d089fe. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/NLZ7B2300403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286aba0e826e1bfc2fbd388f5932a3a7926928421456a843e49f3eb113f92cc3. 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/NLZ7B2300404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4ae4569ae6cc27a11d8e4732b2086f372e2c107eaa2aa1037ef7d16bec631b. 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/NLZ7B2300405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b04c8f5ae78e305a5e23ea27264f986d95ee6a28fcdabf1b54b109186429623. 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/NLZ7B2300406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8214011e0794c0cc12142f47b7445d99ba5717efcc0213897538ca7de1f0609a. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/NLZ7B2300407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfbfd6bea8d32d8e5a83768fc865c48f729ea6a9c2dcc682ea7a058430eeb67. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NLZ7B2300408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b00ce61cb85774428ac62f976e9436e502ffcc08e3df570bc85d96f14b3b41b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLZ7B2300409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c2200db5a34ae4a80eaa954c579e638260516a527ba0ed49c5fd129aebe8a5. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NLZ7B2300411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24cea14e1a7cd092f737677d995b6bce198d844d9ab8352e46a8b3a4886c3f6. 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/NLZ7B2300402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a6cc99bc5a3b2db1b57e720102b0d4b58fe2ebd4e2e7e6cb9b6a3aa63808ce. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLZ7B2300396.