thumb|right|300px|Friðrik Karlsson Friðrik Karlsson is an Icelandic musician and songwriter. He studied classical and jazz/rock guitar and had success with the group Mezzoforte in 1983 with the U.K.
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 0xd3bfb3f65fec019df39007828698ea4f783536ba55b2ed7e91b2093c9d200293. 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/b4afb529-a43b-49bf-b8ba-1467b62747f1.json and https://artists.proofprofile.net/proofs/artist/b4afb529-a43b-49bf-b8ba-1467b62747f1.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 0xa6b6af99805cd3e186c7cc1c55181d2491baf9d5f421fce293ca6cea5226c565. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ISA109902601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8662ff8626479d8a6f0c7d1f1e56490a4aa7ad2f81e2b8e947f984a3b46e4544. 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/ISA109902602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bf73658dff6ef142edc4ece5021449c956c2ad9272836b2a8c222390467746. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ISA109902603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd22cc4f6da36143e1cbfd116e9f4844ed5b014af2503a0ae01c75e7f121ccc. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/ISA109902604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e3c4a7c14ad2f96e553b12dab71e530d9674f041c2eabc640c56d9ab71d786. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ISA109902605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01696be1e2f78dd98fe06396af2b324f4f935ce3d55cc3835333332c371e5c5d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ISA109902606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bdabe56ccf72d4d4d2d8380670a08a76a106bcdd4ca25dccc1a363375a024d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ISA220801406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97e50f49431ee6943b724acbebc5e5471683f28736a358be427a718ce795d0e. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ISA220801407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9ae7b6f8df805422259cfae6f0e8efcd4861451872cbc1363695a19193b091. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/ISA220801408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7030c2712876d029dcd80e9eae6f5dc7ef112f007391633ca9d60d62842169. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ISA220801409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537d1acbcb098eba4cf185f13d5bb1b10397311d495c410ea26e1c2440030c9e. 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/ISA220801410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711fa6031d831c0562fda5a864bba5d0ee45b315f2da37e461807e20d956c206. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ISA220801441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d18ca6a411fddd77d7c5be70c3561dcedcc2a2f56e147a9d72667174e6a443. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/ISA110605701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bf73658dff6ef142edc4ece5021449c956c2ad9272836b2a8c222390467746. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/ISA109902603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd22cc4f6da36143e1cbfd116e9f4844ed5b014af2503a0ae01c75e7f121ccc. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/ISA109902604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e3c4a7c14ad2f96e553b12dab71e530d9674f041c2eabc640c56d9ab71d786. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ISA109902605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bdabe56ccf72d4d4d2d8380670a08a76a106bcdd4ca25dccc1a363375a024d. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/ISA220801406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97e50f49431ee6943b724acbebc5e5471683f28736a358be427a718ce795d0e. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/ISA220801407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9ae7b6f8df805422259cfae6f0e8efcd4861451872cbc1363695a19193b091. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ISA220801408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7030c2712876d029dcd80e9eae6f5dc7ef112f007391633ca9d60d62842169. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ISA220801409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537d1acbcb098eba4cf185f13d5bb1b10397311d495c410ea26e1c2440030c9e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ISA220801410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711fa6031d831c0562fda5a864bba5d0ee45b315f2da37e461807e20d956c206. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ISA220801441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6c0c2e538536e73029d1f77ba8f992217d59b750b3a4c8576f287b501a33d8. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/ISA220801442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a217dcb37e8cdeee7532f908d530d96dda3067bcd500d843d7ffe316b5084c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ISA220801443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2424b378c23259bae2e451af1d2ded5b5d98cfbb1f5fc826aedc821ddc205430. 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/ISA220801444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6860c4b8d2c707b8fa511d532cee14ffa8f48ef7190c8ed24913a6d7c9a0c3. 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/ISA220801478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bddb59d1f9a3bcd05004559587c780e7845b048c6ada3ae5c9fcf0f2683c494. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ISA220801479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaaa3e3957470c6bfa632226d27a66b5b92cf105f7cc3927915b653865ceb76f. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ISA220801480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eeef0fdeeb09f5921607560b748946abf35ae25adfe38b52f072325c1136884. 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/ISA220801481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd54651a4007eaf24b18eacfe2c593c7bde234afec4dbf2708bad681e0a7778c. 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/ISA111000601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345337c27fc8b07589ab42f5e835f5f77b0b965684f22e3ac3dd402e3b1c25c3. 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/ISA111000602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72ea51689be0dac20a39d632d7bab8045bec9f271c4890535f8c922940223d5. Chain 2 (Bitcoin): anchored in block 957791 (2026-07-13T02:46:19Z), 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/ISA111000603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0e5ef8a7b3fa466dbf4b6dc630fdf37f655fad18dd06e66d40ee0cb29886a6. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/ISA111000604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f2f13f333ad39ee659d413079afb87b3fb94bba6ec8330a04ea1c0ae86f2a4. 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/ISA111000605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb891508a0f16b003bf1c58ffcbab866ba1b75c613227e33191f67e32388e0419. 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/ISA111000606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2d5aec7572cd40dba3170b26d97a369c6acb91f9464e6d080946a72d631da9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ISW110807802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b6ef0f1cfeb6a1a96b29986b69baaf7e01a47e2ca0b2e7e6e97ec59acaf1f4. 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/ISW110807803.