Four Jacks may refer to: Four Jacks (film), a 2001 Australian action film Four Jacks (quartet), a Danish vocal quartet, founded in 1956
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 0x3a1e07eb6e4082459ec49b84124e8adf785a4177c83b9eb70a8417f6af157f2d. 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/b9b59957-74ee-4ed2-9b34-82a928e0a42a.json and https://artists.proofprofile.net/proofs/artist/b9b59957-74ee-4ed2-9b34-82a928e0a42a.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 0xe1da8a6977a45ef0b862139146c7d9012e45fc805518743323d83ebbef15467b. 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/DKNA21107613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda4a3d4ed5c1c3efbfcb3e20ee1a412bc0a8ea488c026b7c0a476c4fa2e9278. 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/DKNA21107615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8945d5f390bd571d9ff7a934a274e4ef9615ec7ee5e86c152c8cff181a4e89e4. 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/DKNA21107104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf438f941ba6c79c783869f87f8c1528d732c4fc4ed60ce0b05b1b0034e45ea53. 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/USESK1307527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5260207b0aa8c41e4694eb115e216b7b6a87415359571b444595a497b109fcba. 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/USESK1307498.
Tom Dooley - Dansk Version; Dansk Version;2005 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a83fb58b54b6830dc38ad47be45fefefe1458dfbb6480ccdb4c35f9d86cce2a. 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/DKABA0600178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949bdf732157f8ebb52511824d344ae3607faff3161c52653fa331f57f7c2ffa. 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/DKABA0600164.
Mandalay - Dansk version; 2005 - Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d33fa4b90f5375de9822b7a46c6a40d78869f7cd4ab86c776230d78df185813. 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/DKABA0600187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe2c82062b1ff192dced50363da4b8b760012fd2ad1b77948303557d29732ca. 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/DKABA0510314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39132622fd2dc88a02520b6f10a78f557cf5ecbfe1c8e8e989e2ad51823f0c3. 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/DKPNA0800811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9136a4af0638ed9f69b78b9df3fdd00b1610b5115f7163ac6d138c042283474. 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/DKABA0510104.
Et smil og en sang - 2005 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9aba922c658a2ba11a5792f3525da9be63a5ae56f88cb64c3b7bf61afb244d. 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/DKABA0510116.
Når lygterne tændes - 2005 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1440dc0b842e90af34954d75dc9e3a349fb00ef8d17c8df51201ceccfc2767. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:26:50Z), 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/DKABA0510149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0e75a465f35fd384b14e7bd0b60940e9da37d9d087422da1e49db13fedaf4a. 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/DKABA0510177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe2c82062b1ff192dced50363da4b8b760012fd2ad1b77948303557d29732ca. 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/DKABA0510314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f24d85e1054337eee5f81d0d15a0092b3c55054b17d468e8b617ffd23ec3efb. 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/DKABA0510316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3eb68ba976a6678cdfe14ae1eaba03df9b73b58c507251c679c1590b96efaa. 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/DKABA0701096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a83fb58b54b6830dc38ad47be45fefefe1458dfbb6480ccdb4c35f9d86cce2a. 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/DKABA0600178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d33fa4b90f5375de9822b7a46c6a40d78869f7cd4ab86c776230d78df185813. 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/DKABA0600187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858d00f48e2b0d37f60989175af7bcdfcb63b9b2aa444e6f46c271a367b9d553. 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/DKABA0600196.
Oh Marie, jeg vil hjem - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1497f8a579eafcae4146d70f6b5744b2c51d5d18f0912d8cdd04d2d8dfc9aff5. 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/DKABA9763001.
Når bare man har det godt - 1998 - Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34e10f07a4dd085bc8ceb0f39c53d97577f819ab8b3d24832ed8dd80c541b70. 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/DKABA9763004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8c26c1b1ab487283511f300a0a3c392e381184499a788bc71f11f32e96a0d6. 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/DKABA9763003.
Det var på Capri - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efd63f90839efa3a3674e0137384f1f1137e2f37eaa484696f1c447bf02f525. 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/DKABA0601844.
Himlens klare stjerner - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b6f3ad9ff9ef1d9d76d2f8945f73d7c2fc8a1d6996f770ccb2766d53330c48. 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/DKABA0601845.
Hør min sang, Violetta - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad550e15a7a3e4adb38380e3a4c3e95b67bf5a0c7631a30983a5fbf87029d2c8. 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/DKABA0601846.
Jens Hansens bondegård - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b41a75c1b61861d62124176a6aeca23d8eff10d8d993e4f5aabb4ab936231c6. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DKABA9763013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0d8cb1d57412affd2fd8414e63427fd9b8434eb1fed16bef685ff1985b8ed6. 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/DKABA9763009.
Når lygterne tændes - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8fa92bea802adeb4e584aa5b2c1ecff77b7aba3f2aa43c74b1daa33b2a3dbb. 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/DKABA9763002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f865f42ecc4fc3aa3ed7fb7f43e7ae2f80a9d254f374e0ee19ea086b1491f0b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DKABA9763006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b8b8e172da5b3e6124affd331d55d0eefe1bf57a5eb7e29c121a7fd1da7d33. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/DKABA0601857.
Tom Dooley - Dansk Version; 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611e836eb1964d05ed9840a2582f4ce2b2368ce12af3585b7e99d5c64bab3649. 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/DKABA9763005.
Mytteriet på Bounty - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e0fabe861c34e738b801e11c51cb3506476a87e5df0f6e8bbed343a3f58dfd. 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/DKABA0601862.
Tjener jeg er tørstig - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b81954c014e5774ed43c826b427a909fbe3e3a61d9f7a4c90677ec09d481dff. 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/DKABA0601863.
Slentre gennem regn - 1998 Digital Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7793153f2dee025c0805aef524e5ed1e2301bbf5c8b9e685f6415d9717d3a1. 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/DKABA0601864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15cbfd2d602a801f8119b0dc732ee64673dd4de21138606d0a2df6a8d03f44c. 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/USV351391014.