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 0xe7103b3a7a0cc27512c11c04e3c332a5dcf3f34007f0480646c66471d31ab42c. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b99775f6-0773-491b-82cd-ce0b4891619d.json and https://artists.proofprofile.net/proofs/artist/b99775f6-0773-491b-82cd-ce0b4891619d.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 0xd0ebe0f25c5cb61f1ea47f7d4eac3460743191ddf31ce5b1f68d55f4afa67edb. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR7MS2091001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8660ece3f1ce914dd8f8856222d1b162877c53d8b64dc375e9684e9595a9d3. 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/FR7MS2091002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eceb7eeee8b4835db195f1ae8eca8b5e2fcfb547295c5b2aa9df8553affc02e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FR7MS2091003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c04b576f6d064ed2370398be2b4b1473b992b5820def0650913376698f78591. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR7MS2091004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60cc7f998bd2520006bf0310ab4e26dcba8469dcdc94bc57e516e739a5c13875. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FR7MS2091005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7dbf4b1d63f845f31e760e48a564708f88269b594e1c42b57aa526e4932025a. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FR7MS2091006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b8c2c0ae13111e82cb8c43fb44f4d39c6cc1c1ec214fc41fd0972ef11fd20e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FR7MS2091007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b131a25e2a913045ce47febd8593652b2239f4095685473eea549098f17f2b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR7MS2091008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee6602e33cfcac96418de72826f2c040f1a43806663eaece76d29876317ed01. 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/FR7MS2091009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54fd8147e51b1378af6dffe42fb8dbe2d1a2a3e347f68165fdba74e528c74a2. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FR7MS2091011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ebec5fc87c57e87dc6befca1f811743837f37055d4d2558f6ee2771624cbd1. 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/FR7MS2091013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc1cfa85e8234fd086635f7e48ec72ac10348cc86a7fcd8fb247f4ea252a118. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/FR7MS2091014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff4a816d96eaf5e6602f98510f6e4736c363bb4e09b5fc0ea2b5608d9ef2d59. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/FR7MS2091016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32118ece23509c9086b5c0576d9c8187a1571a9fa7f7cd8df7460bec61786101. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/FR7MS2091018.