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 0x7a694e975ea257b3a099d1434ec0b8970646b43f69ea90a5d13f1e055dd5f93f. 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/3f96879a-fb12-45c3-a9bb-30e9ae537fb4.json and https://artists.proofprofile.net/proofs/artist/3f96879a-fb12-45c3-a9bb-30e9ae537fb4.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 0xd38e6e39917287d9cf5d55c40f9b65d1137dcc154945f492d3bef0d46f625225. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USFCS0600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb6e0106df09233e3d6d7e4e2cfbcf221dfccf6abd434f1911aa77207f4fa5d. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/USFCS0600027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a748937038ae29b4021d2aed6bd7df0f59456be1d94d27a19eb8c7a1e879df. 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/USFCS0600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1ce6f92808631ee72d2371a7303138f3392770aeee935fa217a6e9430d6d88. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/USFCS0600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39de1402ca544040f48a244f72ff2d22f963422dbc23f796cc52d3d399b64e8. 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/USFCS1100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309045ab710df219c59661684692e5ddb834134b407849cc9adeac244eab1d4b. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/USFCS1100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579e1ada29eebe82324c0fad3482caa1cfe7c51467b8ce6bc11703494da5709d. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/USFCS1100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec509e6f873dcc12081aee0956dac71568c9ce2cd3aa00aab3235725bc5d05cd. 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/USFCS1100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10b152092bd3b6fb9e4004953a27d055a6a9db6e9d815cd7eb146208f691cc9c. 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/USFCS1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5732a40d39e48da2725bf68130b636525ad62501c4968eabd6bd070dd2d1f13f. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USFCS1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4eee9803db881939b25e222551f188b6fde4d9aa7881455e12eb0bb483c2f9d. 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/USFCS1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4274c86ae8628c4da9ce7b3bcc5ea9a57eb8f8637df2d37269d1bc2abd889a. 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/USFCS1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee584c1605b1c25fde6ab76f31bd568530cdbde30af928d9f09b16692c45134. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USFCS1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf780839569b02bc5a0939b3396269d74f5ead0e1438a12818d5545b3a2e3a50. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/USFCS1900001.