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 0xb9186090b3252e0579cbf4eb04c3d186eb52e26659e0d09446972773d2e2dd0b. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da46ff07-943d-4e30-a29c-d677e693c9a2.json and https://artists.proofprofile.net/proofs/artist/da46ff07-943d-4e30-a29c-d677e693c9a2.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 0xdd22d0f9a377ec95f527581546b41e97a403798dc1bbeba2a9ea8d187f18635b. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/US7VG1778941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2646abfe193129022ef4572571cc6895400d56dfdc8b4cdaf19de537d3a385b1. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/US7VG1778942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f1d7d0c20a76bb7a925aca39d3f4fc6e2466ea26e163f707bd1d218a0a2fc2. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US7VG1778944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46d45a335a6501bcaa1a884db6d01a0c6c255e7ddc47b66ef64d6b7c3c63d57. 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/US7VG1778946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033fac12f3bfa5ff1ae9a21606c58f9d2172b1cbb39ba536b27d5c701ae4da3f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US7VG1778947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a100bff481805f8e754f59dc79d4cd2c4828ab7e256fe1156429a36cac79de9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US7VG1778948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6f97442be737b3d6d4974e7ab71cd88484c370c9412a2d81e3db674daa780e. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/US7VG1778949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ec6ea0b52e1cfeaa59ce3ea8b142cdd69eb8e71d0859f2f8b2cc5d8d066f33. 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/US7VG1778950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50559f74d1f3a28ef827076845922d039e45f5017fd8ae69dcafe04ddf240bc4. 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/QZGLS2074166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0b0868bfa110cba41874a486a3456e7f0dc0e31d6fad4d6cdf7db0801bbe8b. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZGLS2074169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a26b3da0617afb2bd78b9be9ba529dbe16a91e75a0c582ac1719e2b98e1455. 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/QZ5AB1966648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f8447769517a3871d928b72e1a2af1fc538445e256e7065ea7013fa9cb9827. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZ5AB1966649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ec047518a2f44ae3605803f0c9c93aafd177f27711c93808115b355bdf1cf5. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZ5AB1966650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfb44679f75d81137638c58e34b2a0a9f37099b52223bbd46b0088d20ab65e6. 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/QZ5AB1966651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5634ed86e982a7e9727f22b95425328f699decbeafae29927f13b9cbd23d010. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZ5AB1966652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7b0e568d737e12ce03b0e00c2de3bb60237848446880d14320fa2903d6e885. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZ5AB1966653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91345193b68c0f4341237bbb394628e77c6e2faaaa95a3b665d02b1ba8454116. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZW9K2312409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8faca9f5739196156ab6d0bfe73c2146742ac0b339fc42f4b2b367b926483e0. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QZ5AB2312826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b12b4984f31ba90d08ceb5dc4cf8ff1192ec13821923a109f71bc2a83dc9e1. 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/QZTPX2329758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7a73a6bb89a85287d803c9809ed8a8ff16e54125051429b29174bfedf54748. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZW9L2237169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1b164f8c9b3d6f2d53652c3e3e8c1d1b690c4edd66de81a43fb331df6951c0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNJW2131347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df7b1cb1d43fac48166a04078bcf881e75ff8d878c4f38ef0dd6ee3ccf88f13. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/QZGLM2126368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab7b98f742f1190530bf7f3c5211f2f50e06a4bacfc2f6445f28075535d9446. 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/QZMZ92095798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe352e54d713b207ebf325f93e61c02f72533f464050ceb53ae13687adbd1f37d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZHZ62029923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfa4ef07c277f128ee716713c67a1a012ad95b574841e847450977b5a47d228. 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/QZHZ32058198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8a5aae7c43a891bab84afe51e51196d577cbeb646a9e26f6abed255bbd164c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/US7VG1860113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8c747fb54e633e5d6bf0d407387bafc4a84816ecd63cbf01436a6322991270. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US7VG1860117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dedfe470711f8535e8cadb89384d74f997ffbcf598ff63efd9922a4bdd736c. 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/BXMB21900015.