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 0xd2d16f3b7ead48c1f2f4b6b06048cc46f733cf0907073c3cc936d78bbac52da2. 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/b014ed26-b811-42df-8457-7da6b573db08.json and https://artists.proofprofile.net/proofs/artist/b014ed26-b811-42df-8457-7da6b573db08.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 0x2e91b5e556af99c66dfc65531a6d4646ee106fd53f67639e37712e889f845d28. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZFYZ2587633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb72d65709d6770d8f5b06b44fe8512d76cde7bb53ffb4c640edda369a1cf93. 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/QZFYZ2587635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d87fd240aa6bd00b85ecebe11fb74d37ed43e1e5521d3596e03f4937ad429b1. 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/QZFZ22510011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43cc68e780b51e301924afe1dc7c5922de3c5ff5d3d1001798ab155ca3b262b. 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/QZFZ22510012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f93773f493378ab16f291c04c33749e175224e75e39ba9eb8f332f96d85023. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZFZ22510013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb13da97c52e41df98698746a32d2fd89c8893c56302a6b739953ddd87a040be. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZFZ22569107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfc55b06baed1c4efa2e3ed91d6068e17cca0964b15f5454b3a8d411d712610. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZFZ22569109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a01bb0b7c9e116edd0739098656e92e74ef5bef979f51850497b00df81ebb2. 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/QZFZ32527171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4f36e905ccd7e5a2e2e5f95236694f745acba154275c0065741f723f5b8487. 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/QZFZ32527172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372d441ab6256927238adfac662a07186c2a1dbb36da6886b6af56291178697f. 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/QZFZ32527175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3401cb51f517383350b125c4349cdadb6e8cd363cb1bb2a30752c65793476b98. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZFZ72557486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39022c357dcc5c7925f32379648658129e0b949060a57cbbaced614bc49eb21b. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZDA82550073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41b981f9473faaf6f1790d8078fa71cd58d688efbdec9d3ad651e2b1908ca76. 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/QZDA82550074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2172969a813ec77f1d003d4a9167b7c7b22e6e581da017e0bc42de0ebf0c27b6. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZDA82550075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc386b0212e2292f9366183132c1a27b8b1d8e2b58fe5ded8f6778ba2aed3fd09. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZDA82550078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5de79232d33eddd17a345e870d40e8c9d47bfbe89faf5bb0fe5addd814df881. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZDA82550080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1b1a43b5a4aca8503b7eefe5c46519db1ea0bcda06929275b839fd862502df. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES52569340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c391612fe197a542d90ab5fa0586122e5ca098bc4efbaaf4910bc74b6ff36da. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZES52569341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa3ea45d0622b9bd01709bd8af20540402b50ba751ec680c71d3248006c5917. 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/QZES92586617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb176f33e6e0ec421bd662720d015d673e34403da52aa9171c0bfbea860be28. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZES92586619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44aabab191b81075361046106bd742df575fd655a9aefb3ffec52f8921599166. 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/QZES92586621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1de2460a6b78dea09cbd0e76c356712f027ac34d8ac332ba17d4855a6e6ad1a. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZES92586622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2355cdfdb07a436ff91e64c17c46b949db9240493720542b50a3cbbb048b666. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHN82568077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ea914690ab47cd8a76d747df9bdc00a30a7ceede65ab11edb6d361fd1527ba. 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/QZHN92507906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf58335e4238d0a46d719ffdb64b21e81c1ec880d6e2df340177096fb6bbf3d. 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/QZHN92509289.