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 0x608274b81a9de285cad99fa0100adb02c0a306fa63633d4a8b249558035625c0. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fed4f956-1138-446f-b43c-50446ea53918.json and https://artists.proofprofile.net/proofs/artist/fed4f956-1138-446f-b43c-50446ea53918.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 0xbd06dfe4971284ce987911a2f0f0537855610fd7dbc21bb585dc2ce8af765f8c. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USMXP0810121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb77dd69e8947054f83367e42ad2a440b71c13909ba78b71301917041c56cc6. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USMXP0810122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b8b252d84fc6f8f33f7afcdd9bac3b04b24a80635096b7e0ca832d29f56043. 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/USMXP0810123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6f67a0eb4944612bb8e27487867de9e43f7737f504c9afa4ceccf349a6a389. 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/USMXP0810124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f53718bfe20c13ed7c9a57da6cf88b1ab0b7be6bb9ad11af791a547352adcf. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USMXP0810125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd626518825dbc5c65b6ea3b5890730d23a56a1573eed04fdcb97669965091422. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USMXP0810127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8942e78e5434ed8e6cc32bd7e5088aa289a9dc25a11a4f8f8facd2ea5a297bc2. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USMXP0810130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde871b8e9258caa94846255ea9c4cc80ff4c8663f9b43289d659a3c2c89c2a7b. 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/USMXP0810132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe701b45de5ca83237928ffa0d5f4c8daa997cdbe4cd63737c928ce89ce83e52a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/USCGJ1339917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f90fde069d75b1a11e288d32dc929a84d20f8d64c41a4174e4812a56b958a8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGJ1339918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d191d0e374505d5dbeaee4cffc8a5c111443db52ec9d66aeeb2762a84c14123. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USMXP0810051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38e83a1f68c5ff84453d1754c7ce3946be8abd56ec4f971ba493afc9932fd1b. 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/USMXP0810052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4c626691e2e34192e93e6f3175b2557d125390639ae08d659d21496816da81. Chain 2 (Bitcoin): anchored in block 957240 (2026-07-09T00:47:38Z), 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/USMXP0810054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2134c6cf7b3643960c0cd7e5c3f4a12c98090b3bfbbe1004824b63446c7f5def. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USMXP0810055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bfc06e32bfd34778e60903aa82939080f88fab33cfc4305e4a8da76fca5eb4. 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/USMXP0810056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4640a45ced6fa582371d5820a83762f90d93cea779f42f2e37f49a5e3ff1a511. 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/USHM90460154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a382b4619b00965cb24d2be9a10a94b39587037b478aa49c76db25f618de37. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USMXP2400009.