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 0x518aee8bfb6dddc44238c2025d57363537dc2f10255a9c74c43b83a59b4dcca1. 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/4d38d28c-112a-4966-950f-bad149a9a0ed.json and https://artists.proofprofile.net/proofs/artist/4d38d28c-112a-4966-950f-bad149a9a0ed.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 0x550342bd94404d259afd3a760a90c4205c3cb514f84b3e14c5e440225de408ee. 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/QZGLS2344129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe735ffc33ed5bb6d3a82566202742ade9489be0aa13990a7b11599cc2b57229. 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/QMFMF2307775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec6bfd7cf16c2fd888d6798bd9b6da4a780e5a0aa0f6a54f00b2f7c70fefa76. 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/QZTPX2392461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550342bd94404d259afd3a760a90c4205c3cb514f84b3e14c5e440225de408ee. 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/QZGLS2344129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71407da8604c94fc2e6c36d8dc009d144ecdfb7c2e63757d3273cc73445e789. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/GX3Q92438481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1c9de0478407f072f072827dda2f4db736a0a63f2320ceca4444a97e3c8f73. 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/QM4TX2412603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99986f467e610c1cc0677964767fb95855b08b6071cd73edb8edbf45f82bc6d6. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QMBZ92361508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9919ff8868acecd9c4c79118ee34abf42563523518750d73aed00182fb5f6e39. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/QM7282381538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f61a76171596c7cf2260ab00f9ea00cfcec3e876ab7737deee89e4fa74e235. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QM6N22370253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbac6415ec9a4aaaba685c04cc3abc48dfd124c0eec70170d0c26b1795af26fe. 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/QZK6N2049531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6aa0c1f8f199ed4bfbc4acfa62e0433c0dc9f997f7b2d47347ee190cc13013c. 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/QM22L2002107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa3a45b396aa1eb26cca2bedfa7b8186f7ce474c497caf15e321d1843ef887d. 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/QZW9K2200748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0472a16769f0ed37516382ebe3964680bb5b326dfb5f7026d0ab5018341b3f. 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/QZW9K2200749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4a8beb5b246661dc3af0846c984bf58dd7d936affcc7c98f79a8200ed8c83a. 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/QZW9K2200751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0e90ba9a1e3fbc79a60b1ad3ee89e6d8aa5359be66479c817bc6198c4add56. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZW9K2200747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403576e70db4294b1296774f4a2a3d9542b5d4fdc6a76b9176b43bc26c377738. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ES75E2500504.