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 0xcb02c3d7128cb6f6985f917a8debfc6e2b1e517eb0b8365ea1ede7a457afbaea. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9a7d85e-bdea-4381-83e6-450b0b9e60c4.json and https://artists.proofprofile.net/proofs/artist/a9a7d85e-bdea-4381-83e6-450b0b9e60c4.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 0x09bcc137f039bbf8d008165970dd9b836f9e3a6d6d3ab388918d40b2703ac6e7. 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/USERN1008238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2a0fbd30a2ab22b7916ef42b5a909ef0197fb81f1a348d01f859d69b81ba80. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/USERN1008242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11ea56d30ac0577bc083b522f2156b1e0761a439bb8d81f93af9b2ad2534d7e. 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/QMZNK1600173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcd698e99d8579f636b8d4b0b1909f543f3db26b8e3569ee97ee1225e8a235c. 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/QMZNK1600174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d66ff2f6dfa61b269ce92bc675d416534b9aede717735c7295e78547f21e25. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/PLC171900403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a557bc44ed2e16c4ac55c4ad9f6d4fedcf2126efd406883424ddc9e7b95ece. 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/PLC172500705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11355aa68a0ae1cb3a265ec710a87fd082ce99520fc6724fcdcf98f4008c7903. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/PLC172500701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11355aa68a0ae1cb3a265ec710a87fd082ce99520fc6724fcdcf98f4008c7903. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/PLC172500701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4ec872e940ff52d8358be7469a4d8d716b644d1530a110b3f0fe78d1c9cb2a. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/PLC172500702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ccb12de80a1769ab28fe7a01b529402cb2f65f0606e3315573f086667892e6. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/PLC172500703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38697b6c92be9cf0e82d5e6835cae7b77ffbb00f5691a40ba7261f2a27489be8. 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/PLC172500704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a557bc44ed2e16c4ac55c4ad9f6d4fedcf2126efd406883424ddc9e7b95ece. 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/PLC172500705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b34a2d324f9454b6a8046185dec78ca2d4cd8e161264ddef110d51688d61a2. 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/PLC172500706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d729ee92e11715b4cc58003a6bbf4496003d0c2477fe418761e3b7f5bbfe985. 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/PLC172500707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5ff2e5542b2891e61a48f6a44ec07000417731481cd344c075dcff07d84c5b. 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/PLC172500708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b22346f46fc1ef5047462c1c7c8d0c6ab1872621875faffc12f342d9bb423e7. 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/PLC172500709.