upright=1.35|thumb|16th century Swedish regent Stenonis Sture and wife Christina Gyllenstierna who both operated in strong resistance to Danish rule during the Kalmar Union upright=1.35|thumb|The oath
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 0x321d565c924f852a701017c5e5793a307152eb39670caa22ed7e79c10231eedd. 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/fef40309-6c24-4b6f-9501-d3627f3708d3.json and https://artists.proofprofile.net/proofs/artist/fef40309-6c24-4b6f-9501-d3627f3708d3.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 0xbd5601afc31d7c0488e123e71c98c5b6bd2a33cda653d56b3cc33270d6bdab19. 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/NLCK41075256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fabf961b9748f24cb35e8555832db35885133b0eb2192c09ef8036d64621ee. 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/NLCK41081495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa834104e2d5a987bdd1fde599b63b84b945f4da3d519955389cf6eba974bc81a. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:24:49Z), 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/NLCK41094315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7ebaae7bf11738b56d9be7006be80e71d5feed14cfc7fbfd8ce6a9c7847eb9. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/NLCK41099934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3881496124318338d836de455b445accfa17b17db7a7748addf9415f48cd97d4. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEH742318533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e5c6b4774505c499e9d1ffed2c77428a8c9389056bb7a96684c11053e3fce0. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DEH742323019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89750b715da0513d4a9def28d7783fe3d0ab9477fe839987b86ea37aa40b8378. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/DEH742323021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc6f7d1fe601a710fa7cbbf5fbe7a22324aa53c6babeb9c442dd08ad1c69bb0. 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/DEH742323022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3386a7b09d276cf00cad7e26ed7a1d209fb1758039a27365434b9c22973d3c3b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:31:39Z), 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/DEH742323024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4d00f827d53f578e244fd371d88d17772e984396a196c40f481b16dde6263b. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/UK6491400155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82574dfa86a4de3ef8e6db599ce8136b57bb535e1c1a946232bf766de390e2ca. 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/UK6491400157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158982e9f15c3e94dfe383ae30c5ba406a4315f01b35dd90f64036b303b3c500. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEH742425612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21093ec8bd4b05cd7d80d4d5041fd127257660766fe80b99674e50acf45d4f04. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/DEH742425615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034dd1d8bfb5f0b68e489fd30944ce7fe10148f2796b795571c7d02c6c9bd665. 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/DEH742425616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b2e8494bc9342edf639e233d039835481d5949963153186c6545636de75026. 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/DEH742425618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338b2aed2a0316952048e930b3f30c3ca10df3bc77d886e4ce6205dd37d5e5e5. 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/NLCK42419189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3257b5f836c20494c4b909c07990cd39f686357273f6fb8802cacacdf582d6a5. 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/DEH742512973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1fa1544a536d3cb37d08695a6663123c75a0f1dde0f788758e7a11c47b56fd. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEH742512974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cb7e4e79dcab30241ea7e38c6ea8f32af496f1a6c1a42e6fef37681ae44d1a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/NLCK42512009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7311977388d2452be1657516bcf5a61f27412875d5235e05584034f9011228f. 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/NLCK42512010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d11362e9892d28c16e75017f8e38bf4dc1188b60e15351b5f0700fcdd19f0ba. 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/NLCK42512011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c318b7550f1537503785ee6383a2a3ba38cfbf2a456a2b13bfb8ea9272bc21. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NLCK42512012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84eea280e8c1a18ac63583a3f7ec26eafc83c78ec4a76ce967bb45e60728aff. 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/NLCK42512013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075cbad0f81fc527f174e22d1c02148bbcf6de43f1f5c2fffa2fa700e2dd0b74. 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/DEH742334630.