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 0xdc8811072f0dd0161212f63ad2fa01c6de5be7b4b4e18663680e60a06fcef8e7. 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/c1d4d323-07e3-42a8-8528-138425b92fd9.json and https://artists.proofprofile.net/proofs/artist/c1d4d323-07e3-42a8-8528-138425b92fd9.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 0x27670ac5753a26106a41a208f694a767990444d0ffc8eaf2532da2c824a50011. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ES6081441001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd329c7dda3b57484379ac5bd68e45010a8ad632cb511b83199a1c85e3982782. 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/ES6081441002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a2b2f025021bb8a6c366eeca6121839f5757990e044eee3ad93c0a3f86be60. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ES6081441003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b53041b8943ebf6c2c99ce56fb2ea45ec92ccb764cb9c5878400397ca2fb66b. 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/ES6081441004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb56419305f1a51aa2130925f743e56e46e3fcf7481186e148d4d68a6fe1a03d. 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/ES6081441005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c88058afe3cda99d12faf17ee359535d2e7203e915c95ea924649ba720ba13e. 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/ES6081441006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f1bf37ea8be9d2744b0d3357d82496be302096df22476483c69e75b094dc33. 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/ES6081441007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3887268aefc66efe7ec11ed600f2ce888a55f2292b0f2bc349442e426153d980. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/ES6081441008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1dc194349ace81f54ab5aed9f41e6991df043207647985e147a36fb3a1e6701. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/ES6081441009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8594daf8b7ead11b744fec6974cd45b4d30695e2547f9004039af9d3945b88d. 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/ES6081441010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384f73996568cb4bb69284fe37211f50ec413ef8fe0bebfb7d390c811d4b5f06. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ES6081441011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe3fcbe2933ae79af7fc4f77ba9244d9eba57caaa42e5f73679ab0d5e71fda3. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES6081441012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe968c36084da3e0bf898a126db668eb424a5f562637b739c916ae8faf62c5ec1. 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/ES6081441013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae1bbd08152f40e201bc40e0318ad5c80400d59ad3dfe3589605d453fd4ec7d. 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/ES6081441014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cf39ef1c05403bf3da3edf10ff49c2cae04a587f41abbd380827919ee8da85. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES6081441015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d46903287531524f2e7689289cb88ca34d86ceae04ba7c2848e47cecdfa849d. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ES6081441016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca47f85aeac7c1a4a89361677833ff097ac55f93be9b609249ff60166a556271. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/ES6081441017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66aeab0f003ec0dcb43e2eb54dbb8bd4c5ffcb9499e3a21ceb358e16bb16b026. 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/ES6081441018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c949664f6d5a877d7d0f5b779b82baf7df3a69e90f75c6a93cfde44e02353a. 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/ES6081441019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cfa43ecdb0c610ac76cfcb4c563e62faf5f67636884d26f8d008d3e15aedf5. 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/ES6080983114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b22668621c27dec98bd17a4ad47c8aeb1e1a63b43701f6e5d43bb21cf977a21. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES6081440603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2832deee4f9c0012bbf2e9a59453cd11d94aef03017b031e813e8761f9357920. 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/ES6081440606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0eccbc81454176413f6ee97d0508674e75c1043ab1ea1d1954ae65171e866b4. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/ES6081440612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3340c2f94900cf656d702195c89e8b3fb57961f6bf2dfc982ebeb56cd9006f. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/SE6QE2338933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c7e0c6d1d5939f21f9fc413ec574e829c80d74ab8459983191044577f8e835. 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/ES5701500908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f33bb5b6dd14dbc173ba0d21e1e547dd263f009db52750be340cc97c4af5fb3. 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/ES5700300481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958c26e57c117c01a738e917d8e69414f266f869063cc224d743a7f0112ebe65. 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/ES5702102318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5ee4cf75a4e043de25642e3d12980128547b90aa435507f32680ffa1ec7a82. 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/ES6081142731.