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 0xa03d8d93ddda31bf58a326b75870363be8ee0d8540645290c9901b0c0c8820f0. 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/4cf038cf-5a90-4af7-ab7b-3af350711945.json and https://artists.proofprofile.net/proofs/artist/4cf038cf-5a90-4af7-ab7b-3af350711945.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 0x07aec1649fec996313ea4b77516ae8ae31036b99a34128169b3e9ade2f310adb. 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/CA5KR2448977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780a3bad139fed561998e4000c109e79b1f8a34b1cb4e18faee17d92cdf38bea. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZMHM2251176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb24f260863c28a627e5cdf880b5aaee48bde84030b3fd0dae8c25fcba2b0ced. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBRKQ2168599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505dfc89c319764e98e327cbfa6b1aea6f9fa67350f7c88dc885e25fbc2df6da. 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/QZMZ92124753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e4a2790bfb91b28d4059e4ecc2e453455072519a11f045ac839aadc681c6d6. 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/NLRD52119902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d29a291901217d80de523e53110db643e5243e6c415a98180dfda3f5ec3273. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NL1ZN2001237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeacd3bab3e9009ad9194e19017641b5ef7fde5b732430fa18ce2d6464b642788. 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/NLRD52119867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4822196218469c28b8de4bf2a96dc83a826fd294a3ad0c8577566d4e11485f47. 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/SE6QE2368075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a23c437a0ec087b081c9dab7d8c880aecac4b2097dfc445fdecdfab8577319. 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/GX8LE2333338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b2abf76e2d735175525cb92eb246947b7f15511d7211280386e187e3f88c57. 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/QZS632345368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d75565b0fc8d64aa1f156cca9b139f2b49307415e45cd0bcfe97e4c266509da. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GX89G2301942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a593e0cd9ba6678bde3ef6049ed88ff65af9b76c0b48efb32b4251311b556d0. 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/USCGH2299285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6ddd877b6c452ec6cacbe62da8f1c62f9de22b19b91aa9eec77edaf29a6a7c. 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/QM6MZ2409783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b8c5294fd2e96d0983a8b8451b592424a57e33dcbc77cef86f86eba127d4ac. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/FR10S2380099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795cc69c9c6083ed15aef4a06452d8cd0533c7dd51d5d48727156aca4553010e. 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/FR2X42285348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03272a1dfcb0e5f0879c6db6f5c84e0a863bf0ab1b6d2379867ff0de98bf270. 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/QM6N22376544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b16029889088ff03eb64beb04e6e521d980d98f623e77b3807ec2d35256fc9f. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/TCAIB2414137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3030402df58ebd853949dfb2f003237fc1e388fee728ba4fd6529cce0475f11b. 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/USCGJ2243349.