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 0xa271a88224727b087e3f09ce6c3183ccdec9fe9d25610668f0169cfc47dbbaf4. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d04aff1b-b903-48f2-b926-95609f80bd91.json and https://artists.proofprofile.net/proofs/artist/d04aff1b-b903-48f2-b926-95609f80bd91.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 0x075a285c1aaed8159b48a06268a12656dc538224a916e8069f5777eb2feef39a. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/FRX282175165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e332e1d462632c253452f4835ea9b74c708faf226d3ba9aabf56bf865e5cf32. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRX282175168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddf418aa20d61a219ea13b7a484322a51700680992ef800fc58794efc176542. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/FRX202356221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f13f358ca44e517e63c051d27b8fb3df1a61cee040cf55f6a1e2ee66824b7c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DGA0M2376498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b3ce3b2091a36f6df09af31cdbcdffe0f76fa93bf522093fc3b9033d1da006. 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/USCGJ2205432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac47ca5a340c6f3dd86ecf3beaaed51554ff65a0d2c686d3b0ae7805295e3a6. 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/QMFME2390045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe460a38c6329c991989f58e253a3b6913424b02a435b7b4a65c0b761e58deb6. 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/QZNWW2031686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f075f4dcb11db45b04f5fffa6786968b03e6b4516fe54e4bfd6c92d6c87e320. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QM4TX2366452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f075f4dcb11db45b04f5fffa6786968b03e6b4516fe54e4bfd6c92d6c87e320. 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/QM4TX2366452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63c69cc1bb61c4a82104567a27ca4b376577f786ba8a79f8f35907f7251740d. 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/QZK6Q2157923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615b52ed6eded1dc363de6f859e6ee1841c3f1143e4f987c321780cd9c5c2234. 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/FR96X2104566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae1614e4ea7182b659917dd8280f73d13dc7e6d57bae1a99648fb70def5755d. 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/GBRKQ2293226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5386ee7d0050de109bd0f8a7d76ea3f2e9c3948b2abd082163d8db9cb0efcf0. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBRKQ2293246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd494f527d193b794dcca7dffd145ea7df54a9983bd81f42ab5fbf6514497a55. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBRKQ2293289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6603f2fb8e9f41dc8d5b2d07214c770d2d23c64a89f4b50d3e58ebf66fab9718. 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/GBRKQ2293272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd63a069945ce759a953be92f8b88383b30e526d6dc768b9750149a7d36614a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBRKQ2293258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001d146f74251b7a081444b961d44c32b8efe5259daab1755d4cf644cf3cdd7b. 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/GBRKQ2293255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a983d8727d2247de28ddf9fd9df024658ef0e8be4ed3171b86f6fb0d1e13da. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZ5FN2377704.