Tantum or Lomba Tantum is a small settlement located in the southwest corner of the island Brava, Cape Verde. It is one of the southernmost settlements in Cape Verde, together with nearby Cachaço. Its
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 0xb5e8881cc51ce31365bf9b7a090ddc5333b7e0fe4080d46757b40a7250f539e9. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2c28a37-16d3-4d64-9321-388515402138.json and https://artists.proofprofile.net/proofs/artist/f2c28a37-16d3-4d64-9321-388515402138.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 0x935bc42d8aad6e66a9a7cf4757373af05fc9054b7fe57f83155add53b91cc09e. 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/GBEPM2402055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f76f1065dd74125814f1f1aa766e65a231843a48c63a8601deec1b9d73cf44. 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/GBEPM2402056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fc18660aa9ae39a953d8bb5aae9a82d3a372bd66f3080a91fe2f60b8cbf276. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBEPM2402057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f628b28ba7bf5bf618f135cd4f1238db8a310e9e4819429a7bdc7eab5cb871. 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/US83Z2471103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b815e1eb666ef8d81de9024f9e1e5b0c02a26fa5c6ad9ad06f23ff06bd30903. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US83Z2471102.
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 0x2ef37b421470385832af80aa035f966f713b676bd179affc05e6a19390364f4a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US83Z2471104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7665cdb4edf127e356bc10b26fa6b27ba787fcb2251b2665f07be3c2ebf2c989. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEY472470190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34840bdd3ad69a34f5b49c1773798e1a390c62f0c8ca69f32517b4e67d96226d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEY472470191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc846a39ca6d4c3f6866db1c453c84d0eed217204abded109ed24695f29897e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEY472470192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82570d732f5c66a817a02dc7c580fb56952361f726045e8f0d862ae78f46a3ac. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/US83Z2346183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6aa56d6a13d43724c4c172eabb062e2c1d4a70a491f5d86aec7b8b3cd8f2629. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/US83Z2346184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065fc5af0e13f6cf84780b8706ca43926d899fd6b0cb00e5258f3363460a13a7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US83Z2346185.
EXT 135 / Elemental / Time to Space (Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878290470fc3eb24d30bc580aa5900a5216c7474dc2392fcc73de1f87f324718. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US83Z2320157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16996c0ed3099cd0a5c0cea8260edf74fbb5241e5dc39fa3a84646c8021acc2b. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/US83Z2320159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b9a07bcb367ac99b0bf3c9a95b4d3b1edc86d5d9f9761d0a058b7ae7fe5056. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/DEY032202490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23557ed242469149c2e5c9dc803c4b7a7373a836ca47d84f5ea27b6215051e31. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEY032202492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca336a6dd0a0875756071328e59be39c8c66922b5cfd0b81a45fab61e93aec98. 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/DEY472277952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a67901e66d773dfb11c49f3045410dc46f3a45cab8942aa34173e2096f9c5b9. 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/DEY472277953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84d552c0aba4a0080ce57af95ef4d763fcb82f66899acdf96ba03ab9fc1ff1f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEY472270011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e47d3755016e0f746391a0d09cb1095886261087148d0b7515e2d63e87ef8a9. 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/DEY032102294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93858d272b20d6d20fbefe8e1f5efcc80e2cf0e5bd322d57bc2721f7fadb2c5a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEY032102293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f6a438cc3a8afc75138e11e2b21245687d271be11d24ed04b34b32931423cf. 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/US83Z2134908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54125c135388e11d0015afc323b94a1079c1815b366e1da1f44cf50b7f26e76a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:22:40Z), 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/US83Z2134909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515bedd1f5852354e3507476e3ef861335ccdad2e0c785986e9625814bae4109. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US83Z2134907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b51602b415a83721d827cbe3768a791dfd5155588807563b82c13e0d8f5925b. 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/GBEWA2102410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d37d252650233a2e6e12a00abe22bed817d56afa49bb942ac06f29a5875128. 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/DEY472083471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16999ce63a0e8c8cfc53ba40505f8f5ac581d10e7c0e5a0d6ebf8590e7650902. 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/NLD682000249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d2350d470774546b232c1d26e00b697698ca3d4dd35bc4f7b84102ab25b730. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/US83Z2000362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04e2af2f1ea2e0cf6c0c0dce0321f89580ac30b607c5966aa9309557f386722. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US83Z2000363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9674fc23064f94472d50521a93cf908d6aa992afd1fffe0388bac6647e4d8394. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DET751900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83a37184a5afcbfa0a657d4587d05ea347d5dcc86cde1fb3fdfa9a7f8bb43fb. 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/DET751900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445fe7ebf75907ede3959348c27373553cf207a7aa348b8158d86da172266d09. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:57:28Z), 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/DET751900021.