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 0xf31910ca1f25644f1b6d1cecd191a51583fc526bb96d981832f030ad8bd2e1e1. 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/66d67dd8-17f4-4d2e-9773-cd40f2a11061.json and https://artists.proofprofile.net/proofs/artist/66d67dd8-17f4-4d2e-9773-cd40f2a11061.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 0x7138e949e64aeb2bb25df88a9ad0ef17e569fd1a8a1bb636a756d36a629838d2. 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/CH6542246580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423c47cf0a88dba27a55d3022841d687e8a1e7a4a7424854fb3b308b5881fe6a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES71G2238340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc821b766884e5619a587737ae13cdb2c4ebdbf099779ee2ab086ef306c9f6a42. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES71G2239672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e904a8d81ae60aa4b18d71fd32aa61ac7dc79a16ddd08f1ba5110b6860b5e70. 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/ES71G2239674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a1ea28277993e79a1c799b2afab34a63e04d4dbd60a11b82e48ee5be1be215. 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/ES71G2239675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f46c14b4118137ff195ce8e4514afefd84a0c4feabed98c892fd708a85fccd. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/ES71G2303310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3902be4894fc7ca84c87e7f02965b4eaa1550e00d58f2c4eceddfe94e066c13f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ES71G2316951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba38b0988439edb1f5343463388a35e9b4ff634e4a7975f1a48254985ef46f63. 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/ES71G2335083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc06fd4f7de872deae9238531de5b5dd2f6c3e791d7259594068ccfdcb28a0e. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/ES71G2335085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca780306262c273e4c694abe1d0ea13b7feae6945fbead983cc38e77049c0e3. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/ES71G2335086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a1019d635ed9e8cc21232df4aaefa2f31411e7c00e1847cda0b9fc4943bd9d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ES71G2335084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9e3d1ce6dca2a1d27e6ea2d258cea52ec2bda7095916014d5b0143310988ed. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2423714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8c51c79fdff018e3458283a673a56679760712d6b9c4b3493e3f7cfe15e659. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2423715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e25eea0e8753e1f686ef41c113995585ef4b02272bc73cfcd63c3c3f326e19c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G2423716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b992000082f487187b3306f251192dcbc8f62a34a1d952f14e5152a5edfd20. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G2423717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482c8d0d2b26913532997dcf32bc46e075a00665b128769100f3b8844a890787. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G2423718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cf3ab050a7093bfe8e0306be71c59edf7553e0de4601e985968556fe31f1b0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2423719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081793d667ccb818b134449be077e954cfea6beffba2d930107dec57fd7deba9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2423720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2292f354407a5ca0655b31d471feec5738d677214df89742ffb78e1da8346a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G2423721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef85c85843c8efa5fddbecf00c330b44fcd7c11e9d48521fb9bd1158953ff445. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G2423722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97277c0535cead05faa7e45d5c6b9a377d4ce66f5c7e7ba736ffee66a5c7ccd4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES21A2300076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f8bfd9bbe8b7f8d59148c6b6496a89478292740a0a02686858ba05c6c49559. 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/ESA012557356.