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 0x9316f2750f0bd0adaa9ad20654b34e43ede0a2290e8f04c711cb273f804ef1f2. 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/b5caa27a-c712-4a66-9344-80037bb80efc.json and https://artists.proofprofile.net/proofs/artist/b5caa27a-c712-4a66-9344-80037bb80efc.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 0x31c7690af1e85f58fc0b2f82fd9fa099fea3b13c05d8d1e3bcb670f029a8d926. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/DELJ81901577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9770b6781f8ae7769c85429d6cc8ff17639dd6634d17be25620df3d490bd04. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/DEZC62124546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d13100bb2b7ab47ff1853c899ff43bd734eac244bc6348489a84ea13d34fac1. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/DEQ022111494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b75cb1b1cb9533395cccef5cb2674af9e6dc3d64acd16c8007a1b2f296883e. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/DEQ022111500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794648624cfd286d655142cf79dee37f5ddd26d7b81297a64ead854bb1fcdefb. 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/DEQ022111503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474dfa25d677f0bde47c8be15640025ab2529528fd793badacf907ee0eccf206. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEZC62277815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc500a0b075d814198cbac2f020eb208110f966873788336c86e01ef641108359. 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/DEZC62291779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55ff01d9dd7bf65bc4d38079633b619205f1536c198b0661b5faecc0b1bfc6c. 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/DEZC62381996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c78fe6cf3e0c7c0a9d97fb16d388d1c39913f208ed2755bce5efb7e5d3880f. 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/DEZC62419408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acbbb47954fae1f93e12eac37cf34014f2d2d5baf4a60537978f5de5666559b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEZC62419410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266d451b8d38d2fe0ea692ec28857e3a7475c65359ee48079390fa64ff023e38. 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/DEZC62419411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728a473c19e6a0cea639fb48099e1558b45833ff806d421d14a0773388ef5f4c. 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/DEZC62419419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eec585f2e77b3cf1eb863de11e4855f1f0fffa8417e2b39ca4d02cb9a871c0c. 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/DEZC62419422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e85ebf519d5d7f491fa3d3a0382bf1ad58aaf08499ab369a8cd95ca79bc922. 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/DEQ022281490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe56a1555b8ed996c16e58fcf2ccaa46d75ac831633c383c94ec1912b9f0e01. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEQ021910334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4adcff2dc359a575518dc1fd90dc4702f7e0d0b0c79417516cb0b1839f06eff. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEZC62106530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fb6dddbc70fd695a6ec68aa3dc45400752ada892ec2d997a8350ab030ae8d6. 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/DELJ81906474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e199fd7f71388540208f7303b06177c20c90a5dc3ec887ef450a4d6b200af42. 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/DELJ81906475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e3e9acf80f72a291a6582dd4905d598aa6efd6548710f28b45eb9d632698bb. 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/DELJ81906478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e011e50bdb9da4103f984546806e935ee5263e3dae10abccbf9c7197053e0a. 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/DELJ81906479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdb506ec2f6c2c9154957deef5ae71593300c6df6f97933ce096e68e8dafc62. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/DELJ81906482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ab8727f864c27d79dc8de2301053646a8ef1d32a91d185098c94e5e1fe9e8d. 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/DELJ81906483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87d16546ac2a5999ef3b0445049d661e3a5d2381bcb374bcf7a9b4014555c46. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/DELJ81898928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49c1ded46b763eaf041167f973a520420af64c9b39560fa7730388ce29f918b. 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/DELJ81898929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdedb76c9151c80e0feb4f69baeddef49d440ea10a9e9fa5237cb2e8fff454ec7. 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/DELJ81898930.