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 0x54a74104ea0636eddc303eb5cdbee77874b78e4fbb2d1e36347899c1b879be25. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4681c40-b35f-434c-996c-028081cbbbef.json and https://artists.proofprofile.net/proofs/artist/a4681c40-b35f-434c-996c-028081cbbbef.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 0x8aefc4bc528faf80c48f6ea88df20d4b8fd900f344901aac1f0ea2ed97658ac6. 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/INA4Z2200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f516bacf86d2276dd0f043650636f5e0ac0685a9dc84b9532f26f76f38b4015. 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/INA4Z2200171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441d102c256ff4697609449890beecfd886188f65fe994e6c7cdbc4df5c447ce. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/INA4Z2200173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990ecd8bd8c4cee0048f7755632dd9b6d98a444dff636fc50ae734df04e956e3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INA4Z2200174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4ee9291308aa405cb1df713090a60494558c456674d5968e32c63aebb5816f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/INA4Z2200175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a55dbd5f22de00ec96018591cc957f2d2bc69a3e881fc7b7617082d5342ee3. 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/INA4Z2200176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc1b22ad7a81fca9b29635a9d430e2e596fee61bfd6439e7421db0c476ea686. 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/INA4Z2200172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f86ecaf880d583d7a1176a6da92ac2645f847e5447077e948e056abbcc10c24. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/INA4Z2200177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacb5f2c9c1007d372a0a47e68670b5bc4938a396ac2a124c9179f8f844e058e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/INA4Z2200178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443b430ef0567cb0b9a723a2b80d133b15be33d3c65123e083f70326a1e3710c. 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/INA4Z2200179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e6e25834a8fe48cfb9919ab2b5af8fb915f57314950fd592c6196e9c4c95f2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/INA4Z2200180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906ed1956012d31a2d0eeb053c8c551f30f0714a09406b66fb2b9401f1e9fb4e. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/INA4Z2200181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10df1ce85f84f5fe47348426743321a2c6dc21df9d83036e3c94af47898d957f. 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/INA4Z2200182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2eb603a07bba7633bf521416bfaaa1696eafd177185adf91d761593e6a39125. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/INA4Z2200183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc1b22ad7a81fca9b29635a9d430e2e596fee61bfd6439e7421db0c476ea686. 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/INA4Z2200172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f516bacf86d2276dd0f043650636f5e0ac0685a9dc84b9532f26f76f38b4015. 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/INA4Z2200171.