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 0x5b8b6525ad91763d36b25190e1ba81c6f081550c88cc7152d42f502e86d093f4. 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/a99371c2-f69a-4928-9eaf-b9baaa578b83.json and https://artists.proofprofile.net/proofs/artist/a99371c2-f69a-4928-9eaf-b9baaa578b83.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 0x22ff5c8aee22581f8d984d3b8abf265aea3be38b97ce64f54e60d94581b505df. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCADY1802862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ff5c8aee22581f8d984d3b8abf265aea3be38b97ce64f54e60d94581b505df. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCADY1802862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9ff72f590f43a695c4c762e5e86120496840db8a39ac49d0c58318eac5e602. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/TCAEL1940618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9ff72f590f43a695c4c762e5e86120496840db8a39ac49d0c58318eac5e602. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAEL1940618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd9c81153b906e37430ff7ad65bd9daeffc9d9cdf89c6b2fbf42decfea97a0e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USL4Q2064544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8149186fb355992be6c7eff93ec9e9d4cc8a21fa539c947493f078c25bf36579. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCAER2026815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f40e12eb33b95da44936ee63914d1e4128d435df45b5c39d2b7b19941de4dd2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USHM22086065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b683a4445b6370c069593e5d29e650d789c3d1d3dd32cb7a42e616320b244ef. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USCGH2123899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd440bf23f3521c4bec0ffad0d872644cf7cacc5e5fa8d89f385f57c5e31086cb. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZMHN2095035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733d722911c5e01bfb95b5be5ddff0494dc0831da7364792e45767fc0b542b6a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCAFS2172802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b1641e326859f3e9cb907415f9b502e9427d471aa9770387976f15fd44c28d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USL4Q2126622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6661f55f842c5f76c9a56b8f5ea76c8960883abf03782c02828fb615df4efd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZS662198874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900055ecdcfca398cd88d2f136c846e77fd3bac80e418aa348e7854b6b00c27f. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/TCAFX2164195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb439561d3b7564a7390831ee5154143e7a10edf1e3c4d903c7ac31d7d40f2d15. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZMHK2268303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb172a5ba910b532ebd2e2e49ec52b77e61b2808d8b66a6cbadf2cc97f6cbbf. 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/TCAGJ2266076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7062f59937b6c272d43dd2fee8155bfa9076a4f06015ca331538d7071a68205. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAGJ2266089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803310f3aaef429ca359cb42b79ee15cf9b9a3fafe74daa29c0444badb0a5eed. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZS662220777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59027b2e4d0d1f2afd6f435beb37855ecee1914867ca9402fd7e11f4ec6a09f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCAGS2212226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a262d9df2a3f1516c224131524136b4b696e4e1d72d75a377870cf7e4dff8d6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USL4R2243685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff73df6b1ff4bd68844bbee7e42cd5f2196358c636f05caeedbcb6c3ec33236. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/USDY42398090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77121de670b5f4945a698f2e9e70a9399c3c29a49089c4aaf7796ddb2ab21e1e. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCAHG2330913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bfa3097f603e5cccef37fc75afb2c96dd968cce46f43847397a032d09536d1. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZWFF2364384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda716578c8b9752af52de01c1dcbda073e848b3e31fb66961cca163e9d9350c0. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZWFJ2382897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78cd2b88c15baaf54bb6b6b9df29e3b89a909f0eb4967d0f5f0b162afc0c54a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FREFW2400220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad66e16845a5d7b2dff9b351522c182bb37b53f362b6d4408b5e3e9432165eb. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/GX38U2455913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164f50fb915a4427466c023536c9e8f669a4b07c750605ac96dda77c377c1189. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/GX5MY2485997.