Keizer may refer to: Keizer (surname) Keizer (artist), a street artist in Cairo, Egypt Keizer, Oregon The Dutch word for an emperor or caesar Salem-Keizer Volcanoes, minor league baseball team fr
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 0x0a3c342429e8c1e7d41c6abd22e334cca7c3f80a6f13265c93b041e7bcababec. 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/666e2edd-46d7-4ab3-aeaa-fac9e1856710.json and https://artists.proofprofile.net/proofs/artist/666e2edd-46d7-4ab3-aeaa-fac9e1856710.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 0xcc85afcda54404c804498a903333d8c4e6a14d9e31f43efde2ac4c4e33afd069. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/NLMN21400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3cb38744cbad8875fde6269e3d1b8d22f370b2bc05f74c296163cd8aaa393d. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:30:15Z), 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/NL2XW1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4180b14eb185d8800f1e9f56ab9ac694df519115c39129c6a4377d496a22b6bd. 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/NL2XW1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3dd09864c906df43399446e042b4080178ff8d0f17e56642395e470ed7caf8. 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/NL2XW1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1a86c3acf6d8221f16b27bfd11988b0ae5fdc195b1b35d02ffed48e7643a68. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/NL2XW1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7b9040a8653021975ae5b62e74f16328cbb8ee0ae1227df12bf9c47807fe14. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/NL2XW1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4efe36db24977e3d0388ca7d269797a0ef3b603d020845039f458429e716b8. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/NL2XW1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a3052f8e22c1a89b2c85c9248dff541a310408c26ddc1d8239a89bf45dfb2e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NL2WX1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa81a0dc6511669ac09d2bc221ede2674b60b64a4bbae3c016e4da7051d3245. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/NL2XW1900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3833367a432dc3c252bf5af8c5efcd4c13323679073235b7164f2e9d8e98d6b9. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:27:16Z), 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/NL2XW1900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cac0019aa81ff303d494c28b2c8053f9d6ec619020d1f76bd7464c54f2a440e. 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/NL2XW1900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae9df8d3036857a282f5dded3aa9266f1c35f1098866ab74eff8c298e66a429. 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/NL2XW1900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29361a6d027a06192909d5e2998912b1b9ffc947912909f6e569a0c9972195d. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/NL2XW1900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eea7c394eb1d7ccb276cc4444bce647a081f6c5e4eb56ba3722bdbbcea2af68. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/NLMN21400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438a7e88a93e12a12644709cd23c7de7dbd85604900d987cdbf47ad55d3a6166. 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/NLMN21400019.
Ben Niet Met Die (feat. Kraantje Pappie)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c0e0343c9757f367d514f458e1b0dd784bc782aa4b52a143a9cebaaf1e1a3f. 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/NLMN21400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf94218af9b81916446d1486a1dbd3d31e0777e12840ad218035c36c3c79e556. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLMN21400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8da714b6820bf94d28372c749bf3e39f9d5de7dd2c04864a28a17cfafc44523. 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/NLMN21400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eef31322dbee7653f2efd45db5fd8dae00be3f0b9110991230546e926c92ddf. 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/NLMN21400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521a3f1f4125e095b7fc36ebdd1f423f3943f938780003457ccd347219700c55. 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/NLMN21400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96ae9af74f18860bd7e006c4d712b00e8d1040d1fabd5683a6f5908f5e6d063. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/NLMN21400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a57bec100d4fc5ad4ed9b63367e53536c7a28d0fd90efe55a6477a1ef5248fa. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLMN21400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab8dc4517c5e57cdbf09afc461d2b7516c20f851817c695b6e5deb396bb35c0. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/NLMN21400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38b5d20e12259d80caec34814d05e1c17079cde309856ac77bb0186b0e64fae. 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/NLMN21400029.
Plus Min (feat. Jonna Fraser, Kempi & I am Aisha)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e67be180bf1f91a585f21b15ff51d1ea0a5f41708c2c242a752d84322812e5. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/NLV6L1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb756e809dea8a547c7e149da257a319ebe68ee65b2d9349b02f44a77a7090be. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/NLV6L1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ab491298b37060358506d04f2235d52965f14a20384c13f81dee72e3b6d794. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/NLV6L1800017.
Het Regent Zonnestralen (HipHop Stars 2020)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2f9d2dd0d93718034649feac36d250c9b7da3cef16047d53b69dc3ed3962fe. 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/NLAM42400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5984c8e1a04b326fc19530044ec2df20023d48239c747b5c27b78f78fb1da746. 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/NLS241800301.
Doe Het Voor Jou (feat. Gio, Keizer & Lauwtje)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a39170b63c5643216e5086c2920b5582318207ccee7984ddb9b08a6eaec5f36. 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/NLK2U2000395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd76d4b5e70a16cc7d4032b33b112b05cf1910717d8c128e3b88edc19921909. 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/NLK2U1800116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43fcc82fa00414ac11b648995eaa1fc5f4b3f67f4005b5a6f91ca1d465cb4bb8. 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/NLG661400516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a599dc46d41fc1de9f694a5d06ab046dfbfb33ac8efaf24442ba7b2e07b3856. 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/QMFME2305953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b29eb7ff924a25ce9e182dc5d08cd527aa87698c06144bd85ce0f0ca01f971. 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/NLY9D2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7066164c435884cb59ddc91af8a19c864025a0dfb75f80db1173fa782a9f1495. 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/NLS241700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca328a926aa6b33949297741038a50f201ae6852def4eb802c563e7951bd8d4. 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/NLG661100266.