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 0x0172e0d5545daee46b774d2b894e74e95daad3af499342a9aa99ccf854ec34b9. 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/c78291a4-2d01-44b9-8b28-d3da66b63030.json and https://artists.proofprofile.net/proofs/artist/c78291a4-2d01-44b9-8b28-d3da66b63030.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 0x352d01c1ae2030de0b930662546cf41d4346becf5b5c4e5c1e78e56ad4d33acb. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCJPN2179798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268e0767eb1d5d78f2e762a21e5716e413c736b2b6f0ad05d25466f350f99284. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCJPO2119620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f67ca6f3880c287f7920dcdd298fd33b9e087fca2b868e87fb9b36eeabf8569. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TCJPQ2104193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07ac20403239fb15b6f13520b7bde333b173288b312e5b735cb9b115eda6298. 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/TCJPR2283925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba972f2552fe9a191660cddc7df3c0ce1cf40f6b46a34719992887fc475d39f1. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:10:35Z), 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/TCJPR2283926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8baedd96918915bb8903fd0cb88913e696e7ec4a915f01a8b8e3f1765ff780d9. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:54:29Z), 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/TCJPU2203664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfec3c316be1299815fdc0c1819e0bb8bdb08c1173418fabcfbdd3b44ab77eed. 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/TCJPU2218595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553318894bf87f4a6e69904bf3cfa57d2dcf167c13200df79084d56a99eec025. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-16T00:38:08Z), 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/TCJPU2218659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2e261e589e133764133272c38c9d23adb29c1ad59557f601b2a6bdcea1b3ae. 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/TCJPU2218675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa73156b73235206a4af0f5937bdcbe99b3e0db383c0ce2c8faa69db7bf74ef8. 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/TCJPU2218691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b508a9a86db1638f52c529f619bbc85d4555a3a7571d9007b249ebbf9f26be4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCJPW2349394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805426d3139bd11488ab7deafd4e773726744e0542410c60aaba507d1d884d96. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T02:38:40Z), 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/TCJPW2349389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f573e217252722f0f260935906847d2a8dc43135723dfa5cffe2b67bf78cae5. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TCJPA2479519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e91223e3cd821f5099c93dd629a78fb43f81b3cb1c6890bdc045937b79c81f. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/TCJPB2429127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b406a0a4d6777077169793ed1fcfbfe54a633b7f681da0387d2097062e927f5. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TCJPB2429131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dab5c66e12c5e32a3f42338081e442fe3bbe9feb2b58a9edf8bc0a4e852582f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:53:32Z), 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/TCJPB2429133.