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 0x165a818dbd43bde6e0cfff945138d15f563652516c052a65b40923cc89f0bb94. 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/92329419-c1a3-4b4a-aaae-6b8258ce4660.json and https://artists.proofprofile.net/proofs/artist/92329419-c1a3-4b4a-aaae-6b8258ce4660.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 0x3bde0c41b212f7f03cd6a5db44b5658c35612f2d806f6cf44727529b1d0ca248. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QM3DF2293684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5306db203deedfd4c4e76e79a04fdd99969ca00138940625afee3f412407016d. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USANG2408424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2397a6e602a4e650a8248f94ab67429c0a6de3c00cb6f647f510ea1035b9b4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/US3DF2459406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a62e45a3ac472c12e0b8c79a15ca0b847c29d6ec2e6a173533bb9ae37a0e13a. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USANG2419653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3714c361032bb7a7d50400990bf0e0bc71022d19b7e81104a1e77e8b4602833. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEZC62444664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4650fd7d5966b8041baf09547f4090379cc0a1a6c43f1584870ca77157a32735. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:32:43Z), 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/USANG2440143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a05458306c04e3174e93cc48201006d6c74d89fbb1bdbb8b4745f38499678e. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:47:38Z), 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/USANG2441565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x396510589b98e432aca200b34827a89dc4637c7a7efae4415b8c3cdd1b138c30. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US3DF2501427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6db608b1347b3af334d57f38d01505405efbb6faba8282e40a9b8479b18c3a. 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/US3DF2509800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c12f3aa0a0773ff5c3a1ea7a7b95243b445a9a20e09f2f3de6d6d285b9eb86f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US3DF2533272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9622ddc8e5febb62bc02a081f966dbf2d265cb261835ca2c4e82163865e20c. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:17:48Z), 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/US3DF2536646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf888ddaccd38bd4559c6d53e0608f431c1685ca7aab8635c2c6aad202542f4de. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/DEZC62510889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99002e0845403a954caf00fdb5fbaa52c8052afcf65c3c8321fe9763fd9a9fc5. 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/NL4YD2200127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cccb05e6065f4051f644e013e5063d5b34b2ab62918ede472100ccfa5226b9d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF2478062.