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 0x1bded4b897a9447ca7c33ab8b34145983ca6c2816bac20af13d3710abc9cfa6f. 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/666f8530-7da4-4d51-a21a-3170f278b911.json and https://artists.proofprofile.net/proofs/artist/666f8530-7da4-4d51-a21a-3170f278b911.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 0xe42eac4b2cc3730e7afeef94fb60bc68dc94a840b89da0c90e1335e79fca60f5. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/FR6V80215178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72cc59c4069b341e231904d90c7d3b84028f7091632dac875052a958207ac210. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/IT8TZ1818001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dba9a7938ee3a9ea861945fcb2fe4f14ab0481da6cda0a911005bd7ecca64bc. 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/IT8TZ1880603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3326152f3d4dce374c8b47420c526996a510ac0edeed956ced5f4d3e4847453a. 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/TCAER2032102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20998995ac2ebaf62c8ce6589081bad18661e2c0a301e84aa7a693271a7e544. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCAEY2071304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afcbc6c803b3937c2fa634082b5c34864561ace7b8abee966723b491b0be800. 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/ITR632100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2552040e6081d5d728e39b7b5c01908a8c008edab9abffda27ac36b441f65bcd. 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/ITR632200244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d73c5bf2446e9829d8da446c30412622ada2ec2719bc6e544ed98aae6dc961. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/ITR632301244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede764af3177f00304f14ac2c43404c7c1c439c30a4f76cd56a2a833ace17225. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ITR632401077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cda2430a66e2577440cde6a333252dc46048629b7ac316cfbf6d04c51185d56. 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/ITR632402599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4a88a4bb6d0c2d3d72533da09d6c63871291cdfdc480978643bf06c5297aae. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:35:06Z), 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/ITR632501045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d863e5a49fe517f1e14c5e26e1e5a024a1e70f5772d3c79834041a0880ba5a. 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/ITR632501353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc469e9c896e334062ed4939b726a7eacd07c5f98ee436ad2d34e38bd1170e72d. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/ITR632501354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe6670dcc45dbe4830305286eac7e8eb74c37519fdf0a110c6b4f117443dfa9. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ITR632501355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21686edd89ac61492b285f01148934aea9ad3cb62d977aaf9868351419d38d1. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/ITR632501356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71b8dacc1fa767f61e8d53e265cc8c62fd2fd089a99c468ad1ba42b80d4231f. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/ITR632501357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77cda9e4ba377790da05fb77a36556c363d7d453767f3631ca1f0ac4a30691e. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ITR632501516.