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 0x9f3c09f6ea8b57c9e1e72d29b2b741c95748be40ac64deb32a7fd53247946ce6. 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/49af62de-61d2-4405-9ae2-c0f0ab41a508.json and https://artists.proofprofile.net/proofs/artist/49af62de-61d2-4405-9ae2-c0f0ab41a508.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 0x72d82bbc10ab2fab2271e30bc9a677190fa77b36bddcc9f0c29f285659dfaf69. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/NLF6H1500035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ca79a014cd50915f686d43902f625c4288c459c911125b0c3c06b1f2d89614. 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/USQY51770613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aaf0d68c1334ec5f17650e7388d29ed6ff38bafaa4b885fb282b571c08b2fa3. 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/USQY51770616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c61866ae4f2f08ec009f8f650e1e353006a7c3a6c77e474a84c7bd97ad7780. 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/USQY51776492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fee8ba80a872e5f7fad751999f18f11ed8ead2d2f96d43fb52b0f516696778a. 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/USQY51776494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b9d7ba351c86566ee1b1f79aa16d424d74ceabd1d3457ac940c379dd638796. 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/USA2P1938462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41fcb3817f261e25e503118d9373f9bc099d087157f9398645eb9d5cb822dd5. 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/USA2P1938464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6861fed1712647eb82259886db3f811088214c35a2a313ec9cf5efc541ed9667. 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/CYA112000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc25abf78af3919ebb44112429a916563baf6725c0866bccfdfd4d21de57768b. 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/USA2P2402074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9925a61a55628bee90badec088eed7295d4708a668673b5d1b964b312cdc75b. 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/USZ4V1900031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f922c358315d8a777e3918c17d37ee3bf17fc0e0d2b32cca312ab81e2f5483f. 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/USA2P1912487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ac6db91cdc799c4fb34e33c4eae22e50e587be49878354f155bd9cd1a9c4df. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA2P2043810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afa488757580ebcbe44f0780b95fe1ec7ac6bbe3ce3a35f13f0a4245db0a536. 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/NLBW51500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf262658639f3d4d6cb49bc15a070ea493bd16384b035f58a9d0244e2d194515d. 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/USA2P2474268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0aff7546212a18de07500a6b9dcb98601654e0f3d3b5e71269b6a11403bbd5. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/USA2P1923364.