thumb|Bringing in the boar's head. In heraldry, the boar's head was sometimes used as symbol of hospitality, often seen as representing the host's willingness to feed guests well. It is likewise the s
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf966c237fa8ebd5bcb6b88f599e7a9e7d3faeb0f7c95dd01fdd13d005e6bd5b. 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/21eb8d20-d17a-4259-abf0-96af4838ab37.json and https://artists.proofprofile.net/proofs/artist/21eb8d20-d17a-4259-abf0-96af4838ab37.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa86cc3812fa8539f0ccb91024ba4eefadec9de3e6d4c16a4c2cb4fcec733d2. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USMRG1243104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d21397714a281b5a4786e720328dd5762658a98274bda87a1d44432ffa3775b. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:26:12Z), 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/USMRG1243107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6037b2e5111ded9e7f692d0f511f5f7977fb7fdc4402772a2e9075acf7667ed0. 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/USMRG1243108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d914dc50eb4993f5e78f9d081fba1b64b555293a0ee6b6222c80ec0551d780. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USMRG1243109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb799412bd8bbe98f11466785520594e8dfdc586d04aef6b0d76e35fc3d545b09. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USMRG1243110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7980dbfa8fc9974a5f0835c6e5163f5d137f146b1071e85e0873c83871a7463. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USMRG1447101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9c3527fd7809bf5dbbc7799258b16b71c4a997c6a76d33c549eed8f7602125. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USMRG1447104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad24d6d71b285c360b7516400bc67ae80f75e9ddc1cf52ae7b77fc01b2b9418f. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USMRG1447106.
Polyvinyl 4-Track Singles Series, Vol. 1