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 0x317a36387121d8d2dd3c52b98f329cdbcfe95127c6dadbf2d28b876640cc4b4a. 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/ee69dfd8-fa3e-421a-a8a8-8973f0a33c73.json and https://artists.proofprofile.net/proofs/artist/ee69dfd8-fa3e-421a-a8a8-8973f0a33c73.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 0x6d6afec4dfda7975b4e55fcc32e272e13af5f0f1ddab09b2b442bf767c589bde. 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/USCGJ0795341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a51391eab272276596f5e01014fe55e43f609ee02016b2a3de47f5a37e975f. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USCGJ0795342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd8d34494e3858f1162d239f131dd302607625108d3ed0f2f479e404ac26026. 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/USCGJ0795343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d627873272a2ef09828bee20cd0153d6278c96970a52613ff7431dd6f0b9613. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USCGJ0795348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8ee02f905820dfc87bee842819ac5946b47693baa28249a9f499cc0d1e3014. 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/USCGJ0795349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10decc5284a16d4bc62d2f67b0e12eeea59859558b4d3ad8c8b2f37a38a92aae. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/USX9P1016910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f06716511c469f06070eae9f81e9e8e859e422467f616d870244369a97c309. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/USX9P1016913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c46d90fa167a1acd72b5dd4f91e61739f9f30f494c5166c9f6be79c3aeabe7. 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/USX9P1016917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125a47d0696228aafd1156b00be448530f3f3355231c1a52ec065524642f2cdd. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USCGJ1798111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a45b7d27ca5b86850bd52621e7ec19022cc38b18fc3748b28400f70283de81. 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/USCGJ1798114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34f6b77d9bc6a78100b5bb369d4793b0e4b826b1f4120871a1c2359c869a381. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USCGJ1798117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8efaad834186b3df76aacedc31201cef18f1622c3a07b26867aeda7a4eb7a4. 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/USCGJ1798118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7278bbca94c9e4ac80d80f772b0288fbe62a6c8ffc16c1f0a9558fe119c1ec. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/DENL61900107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953b8aeb4c629c53dddea2781b7be45d62beb4b0f35a44b057fe11c35eb2eb51. 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/DENL62100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe534fdf6dc2c6e66f5043fb687049c2ab18cd30575af96e3dfa86ab6b23e19. 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/DENL62100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf34cbb17b48d8ef4d121644bf62272ecfd85be09fcb0035c0c06030ad8f82ab. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DENL62100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ff8a2e7e4780691e3621bb21ab4c52432f9ec141e858818b54badd1a524acc. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/DENL62100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3733a0468783be9108a85cc85ae51fcea088b8f93d0922e67c61f4a922e65472. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/DENL62100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56bb1b1baf22c2e8381e366f175cbfaebeffb8a1cc82b1bf2e1490f1662fefa. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/DENL62100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc8e758e281e1688fb6a604a714fd263124c53ec61a5ea90755621b8b3e3598. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/DENL62100109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc72a867dcf438bc1b49444c0e888498fa52c00ca2af88d9b1886c85e7be6f78. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USL4Q2283121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65ce15726acbc2588db3e2a0453fbbb48754c64e7b75a83e7622439ccb751c0. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/USL4Q2283122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c4a9c72069dbb6d2af71673e877535d1a92e5a412a20eb02dfb5433e613108. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USL4Q2283123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706b67d82cd72bd9bf1f6463d616a4e3e20f0ab20833e6849e9e9bcbb1321319. 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/USL4Q2283124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad14c6393df09452bf6106a02316062f450aa264b4f2c07f491787adbd80eaae. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USL4Q2283125.