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 0x80c335f356c7f039969d59831e63e6a24265b486b329ecac91dd961b8d719d94. 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/8df10163-8f00-425d-ad31-dd26bbd55f78.json and https://artists.proofprofile.net/proofs/artist/8df10163-8f00-425d-ad31-dd26bbd55f78.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 0x231926dbfcf6a536779bfa72d1ed25aad111d4875619d6be6fc6bda4c717d960. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZHNC2094712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd655dc00a719d46dd47f79003b34d523081e766939aaed6c1e91cd97e1600c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ES09S2200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ee914c97ec74f428f540c00c00705e7864bf13c713d1a625d65751dea5ef6d. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/ES09S2200388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d82c0c2751032a8fd264e1a16268407e0d415222218f9241a8c043ac2a2713. 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/ES09S2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d82c0c2751032a8fd264e1a16268407e0d415222218f9241a8c043ac2a2713. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES09S2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff69ccacac80653c7cea725ffc2166d25a00aaa3095a7b781d5dd2756c43638e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ES09S2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff69ccacac80653c7cea725ffc2166d25a00aaa3095a7b781d5dd2756c43638e. 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/ES09S2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7876ec3c713c616ff5ca235570bf094fb5a768809e185e7e9bace1cb18f939f. 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/ES09S2300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7876ec3c713c616ff5ca235570bf094fb5a768809e185e7e9bace1cb18f939f. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/ES09S2300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc703b4b7b85debec7e840c7e5f1a09966f563b405f1c3b42a643e8cf72387d78. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/ES09S2300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a41f98caa585ea68bc336a2fdba93f3f9f5ec931a6956c190d76f55759f8bf. 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/ES09S2300124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a41f98caa585ea68bc336a2fdba93f3f9f5ec931a6956c190d76f55759f8bf. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/ES09S2300124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7097a215cbbe58fca16f3e2c57780f8a2e292308eb243e646ded91ec6f90a55. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM6MZ2513992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428fc3ee988a099d9d52382dce9165c55e6a2c426488658deee1eb5c1bf09a0b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM6P42566164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cff8a9e7b4d6b947ec733a09082e3721f7fe619cc8ed47e320636288280ce05. 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/QM6P42566168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafabe1da0cffacd33572c9aee4991b45885f2a724bd09598fa568b97667cecc3. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/GXH2J2522147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fecd3611439110ee67ed3f6bd55deaa50e54e3bc9c405ee30124a47860e392. 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/GXHND2507652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf43581db0b4d34275b961dfad3e0fe32dff343ec858e67dbdd2187cee2aa6b. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZK6M1903230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83148dcb132344477b0a64c2c044ebf0ccb076fb6eecddb29f17bb9cbc20201b. 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/QZHN71923621.