thumb|Kal P. Dal during a live concert in Lund, 1977. Carl Sven-Göran Ljunggren (28 January 1949, Arlöv – 18 January 1985), known by his stage name Kal P. Dal, was a rock musician from Arlöv in Scania
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 0xd7ee597b7d0d167229594f5f3820ea71a218c2981c62063baedb7fafecad51b7. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/28faaaca-22f1-4ebd-89d5-59e921ef8186.json and https://artists.proofprofile.net/proofs/artist/28faaaca-22f1-4ebd-89d5-59e921ef8186.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 0xfd37dc9dc5a5f6477717d0798824db97050dafce57ce09b989f1555ac61903d8. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/SEBFO7701070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40120f9b3995fd982c4b577182af306d68513cc1c92dc12db8a10bfa3fd0bcb7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T00:08:02Z), 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/SEBFO7701080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54bcf6b2165247f017887d2f6c95788b81a5dfaa9149feb14dd60720fc6c774. 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/SEBFO7701100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6706a959fc19133b9cc89f8cb2a2efa6a090ed1a34e8f47064f71f2dce79d0bc. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T08:28:58Z), 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/SEBFO7701110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc424108cc7eb0870f35d347d3d219c9b7744017d8cd25d6f219c0d4cd06ad1. 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/SEBFO7803130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b30b7b1d168cd740a867dd9220f0c4b02258053feaa00a917d066714ec7ba29. 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/SEBFO7803050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43f65303f0c18408e91581d9c441dc105da8e6bd908e6c51a5c882bfe14e8e0. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:02:44Z), 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/SEBFO7803070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fb974d02e518468e78290d63b11bbe03e31d6ecbeeab1d69be829e521173d2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEBFO7803080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb13aee68eb7bd3b5976c4ddd3e9beb51f00674f0a2b404393be05ac27c6a79c. 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/SEBFO7803100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef60ed3c786516e53355616c4f84131303cb7ebc23bedb4ac607ddabcd792e8. 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/SEUM71200727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be0c0163f9c7ace5f12647cd18873a86c3c74475d6644378e4dc24514676a2e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SEUM71200728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591f11f2217c66b459fa11571102183668752dbaf920dda4ee8c730a3b262c3d. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/SEUM71200730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a5ef9d54f22014abcaf13431e9b0b6dc07493acb20869d4a67d8a44ef3e96e. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/SEUM71200735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd6b8a094bfce831de75776f558a5aa5ed86ca9420dd491c603d4f31450b270. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T03:36:47Z), 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/SEUM71200737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9e869d05e291c82a3a1e373d2b0e254559226b249c23640aba41e8cb69eaf4. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/SEBFO8003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d3a228f9628ffecea38ddcc520d69dffe36b3cc8ccd61b67ad3222b66c6c82. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/SEUM71200740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebce288470f1bd901583ad98cfb08bc34877c680d84042db550db3354816b96d. 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/SEUM71200741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e821f803d9b5f64784d7a754ebe4793fd0c83efce69743010c025e1d31da49. 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/SEUM71200746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfcc1b17f4d933dbc1695541852e7fcb1c27886de9ded03c2677be5788832e5. 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/SEUM71200748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f50dbb19a30a7b9b4f8447312c22351778890cdd0700098ca8797ea564fef93. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/SEUM71200750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c401406094b27f9b9c1f642a6b80c09825f1d73863c88396922e4d130dbda6. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/SEUM71200751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085b14350f3b334a8736d2b402c45b4cdec1546dd5f75d27b35b7a6c5ef0f8bc. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/SEBFO7701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5519c77d2af0459b61c73ffb39baaed23aaea455d49ce1a9d21b928be9dd8935. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:10:52Z), 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/SEBFO7701020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabcdd12b662ece77b650437dd462746f12c37bbd1badf4233e9fa9db5fbe5bc1. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:27:53Z), 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/SEBFO7701030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3fbc5d3030715717f24d1b0baf447f8f041ec2405a5f0b0fa139c3c9cff9ab4. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/SEBFO7701040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54dce93e25cb61b2404f21ee763f8d3dffc026e3563dc0bb2bb70e07d1ddc3b. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T09:57:49Z), 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/SEBFO7803120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed36f1ea22142c4eb5ee59d012bca0d247f44a85a7ad316b4cd8f633792f439. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SEBFO7803030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe39c3ac425520282523cdbff3984ccd315694d2071dfa60e22341d041d7500. 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/SEBFO7902010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5923ef7cc951927503bd967a82b3da798ff3345b5324dc61ddba8064e346fc0c. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/SEBFO7902020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9e869d05e291c82a3a1e373d2b0e254559226b249c23640aba41e8cb69eaf4. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/SEBFO8003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a7ba07b0ceb5f70034d6a9f39ad5dac370bd175f0848baab852263a9892315. 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/SEBFO8003020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19392be8755da881f3bc376ec2a2827026df4c88e3ab5b91f1977abc2ac9739e. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/SEBFO8302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ba6248c8f60422ece180eb5a572c56a64e10d3a7417b09e5b1e7862f402699. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/SEBFO8302020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9403f0636d584ed3113ee70b6258f86f7b813acec6a2584521a27949ef55c3b. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/SEBFO8302030.