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 0x69ec336cad8f2a0d4dc9a4e784275df444ac333642f19ccea6cee20ab3441858. 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/21409367-744f-4188-ace9-c5fe77cab141.json and https://artists.proofprofile.net/proofs/artist/21409367-744f-4188-ace9-c5fe77cab141.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 0x9248cfa75b699c018efd049f4dd65143f9f84dd7842d503fcdf9572ade2df608. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/MXF150200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1b8d1ce76ae5f4e35a0fb5981f139a9509edaa8b4bfba690421b525905da91. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:00:31Z), 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/MXF150200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158ad78b487af002b428bec641f11e75ae04ec3b244bfc45eae6fe2d563e2470. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/MXF150200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325692239b58b431c76cd8c83535fae75dddbc872c347a93bddde3553245f87c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/MXF150200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f1eac034f66f2867495a760e6f583488a4f3be46445fd1332bb1f90ca7f1c4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:28:59Z), 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/MXF150200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1098ed5df04bd8bef9eb7f48d2b9a2507af3dc38135cbcbea197b7b6348a5070. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/MXF150400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee97abaa0c018d7ee5b32411ef1ce570abbc219ad521dad45a4b105d0f583af0. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:54:01Z), 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/MXF150400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f05d4faaab30683306bfd2cd6823c201f2b1b0de460edf7d70f594e25ed1495. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/MXF150400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7abb9fa17b5311b1bab991e7a6f427028296d5a68ff5c7e59bc12655ff2cd70. Chain 2 (Bitcoin): anchored in block 957674 (2026-07-12T07:50:41Z), 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/MXF150400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc491e40a2a054ba3b798b11ce2b1b9f8c6aa7a60ae38187b44ffc44c280d2987. 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/MXF150400110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f74943a1e948a226e3c1459d447b7f9c459d5db42d49772410218e2d5feb48. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T19:56:04Z), 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/MXF150400109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19bccbd729d7a7f898dea09454ab78b3225b136545083c65739658e085317c05. 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/MXF150400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8afcb31db6f8e67fed29c05cf1a9a90204da0ed12802b86c248ceca9dd11f9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/MXF150400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62cb6b13d4efc0eceab61801e4d6dfa4ea1553f4ab1851fb5edc562bdb5acaf1. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:32:31Z), 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/MXF150400114.