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 0x8cc64101c8df175133c281e0787d560f82c4606a9aaa7ee1331bb0bab236c637. 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/b2aa6fbe-157f-4037-a794-ad32d5d77790.json and https://artists.proofprofile.net/proofs/artist/b2aa6fbe-157f-4037-a794-ad32d5d77790.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 0xf509f350646c822c73d291af609910fbe0545277c80ee5a478852bd400dc3d4f. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZMHN2453344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00eacff9d55b0dccdcc869e3721162a32999a00bf0a3e88d23cfb3f63351f03f. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZMHM2433194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5511ff7fdddde410cb16bbe5c4d5cdba897a4b51ace092c886c162b9eeee456e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMHL2499727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb552320ed7b4b9f8bbf1ee4907a8ce9912cd6f00744ee3a3bf7301d8fa391509. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZS662408983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54092ba253dc6905f172a87ed5b1c5df58c185e7fdd6d548f825bf7633d010e. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USL4R2470742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428e89c890fb36335e4ba49072b1c72efd76534c7f6bede078cdd380f7cdf31f. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/USL4R2470743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc700860a43f958bd9db9360c70a1b3b252217b856a15ba75788474de9a31f95c. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/USL4R2470744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d9a4571ae4db6e2f287787389d8f5a82801ddf81c170788d7c0a1705135901. 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/USL4R2470745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5182e04e332dd7fc5d998bd4491c9b6a127b81026990ea4d9f0546b2810c5e. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USL4R2470746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594beb2c0040b19393c61962449e0af63f1b9f4e328cb6c847aa0fa89dd3f880. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/USL4R2470748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7f3e382656317dd84adcf6849368c394c28ef578b9470516340c448634bf4d. 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/QZS672465951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9aeccf21d51b178df27ca6cb09c8df02e45001a8bf31d9a8495a28b95bd489. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/USX9P2423006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46678d468157063513f0f5708560b8d2bba609c9430d1b91d0034ea259602e44. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USX9P2423012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab986e365cfc18b2dd0a45095842e9f62858fb49b32e04cfbfa2d18de40d537. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/USX9P2423014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6426b6c1bc81f62fd875e575934278b4f7a8e93d9014553d877b4b607bb89de. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USY242455191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e904ddea637e7b3f5cc83c89875bf13c6ce05677fd1fd8cbc2e125f638c92fe. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USY242455192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47185ac2b87e7d9e39c290fc47fa42199aff1f9ebe64488d27080e4fdc16c179. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USY242493033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842b663f2d915982f1a633fbac4e521582e03171f8e22a9ade861c6245fb3242. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/USY242493038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1c636458b844ee355d50710dc92062c4c1ade50ec77fa17d7596dd66eb9378. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USY242493041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc87b9223c7b81d6755e2dd93a44de02794bcd05a54f6956060e585992759e9. 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/USCGJ2597030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f15ca7a0db7867433a6b3d396e446b0a009518990cfb63766935ee73b9ebc6. 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/USHM22524562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241bcecf5a3ec5556dae0061017f105bbf8ad32aae43be3ab4ff9212a5ae6a47. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/USHM22508900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2317035c78dd89111caf4d67c40c25272197f3d0d374cded7a1f26b95b9746f. 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/USHM82564211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61978ac8c7962a35e47c9e772f482974b8f7de0eed4ad9866b8e4318a1295456. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USL4Q2500327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f15fc3df10829fe3d21e50e17449d3026cfb04b346a22a27fce17a2182de38. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USL4Q2500332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80776bc344a35a7dc6ac52612f211a02e8fda43e9b90e14e0e723c5bbb0be230. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/USL4R2521444.