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 0x6d7026088dae213682f43cb63dab6f5fe8ad08fbdca1a580298a27210743d7f4. 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/fdf25fec-4c3b-4063-8e98-78ace5682756.json and https://artists.proofprofile.net/proofs/artist/fdf25fec-4c3b-4063-8e98-78ace5682756.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 0xa6a0a2a481f0322644abb872444b175dbe71faa0505f0cdd5f559e54039bdc9c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USTC80934131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7157e61624f5c98ef130da94620234062a3ac1fa5ef0a659645c033da1f4cfe. 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/USTC80934136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d780704ab3141fde98ff9847c9d315c715ecbc2646a55d3d01f299a59315d77. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USTC80934149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804d9a78dd5108f3ee6a9963b97c96a01fcd8af131b27fff80cbe549674c9814. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:05:00Z), 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/USTC80934154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f56f524ef0161de78c6c7b06d32f98854af20af1fd13d54fd6f660885ff96a1. 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/USTC80934157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ee462f6f51a339fcd524999e2c01d9fa2dce57fe342afb7e8429badb6b8c20. 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/USTC80934158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21416b078969b65dee67c54d6686389c2698d6c59e015ea652fbc171408c40d7. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USTC60802261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c63cfdb869fe44d85d3c496277b87274d66d2497825c4654d9c0a7b2b14a5ab. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USTC60802263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9ec47dc901abd409939174a4f52d2595eed9960d3ab537a8c2541af202d88f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USTC60802266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf979db06d89d582f564a3573e22d3ed9c2c7179b465f4a4526e17653e8d8c747. 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/USTC60802269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72086c19e6f5948a95c8ea358a7e83fae7061120297dc9f9cc79606494be519. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USTC60802271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483efab0d2eb7c07422bfd4f98741c0c78e921da55d82920153900a105a5cc9e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:01:38Z), 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/USCG61600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9f0e6023bbafbf223999c5d2a5d0db0d5297ddd095c818b7af71514c0b049f. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USCG61600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01a0207f206823c3a00c1a2af132cc6c8ab9062f8c4bcd9939f4e2d1b9a42d5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USCG61600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48041a1dca0cccde24694ae0787bbe912fc8d3e72c5055c003d83ecb223cd2bf. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USCG61600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced5bab61cbe196add90617b70ddcb0eed63d065c8cba6ae0c92a4f47ad5a1c5. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USCG61600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a9e15744e04f1d74a4639017b4f39a64aae5fe688311957705e25d830efd69. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCG61600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e070bff12c98221f899334698e60e2c8614a36e96e87421ea30382ee88a786. 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/QZ2J21505635.