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 0xa8308f8b4ad3bc0ed2f4dec355b606ffb18054235694d4d11d48cfaa5e81742a. 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/b513c2f2-8c25-4465-be70-67d904c0f9b7.json and https://artists.proofprofile.net/proofs/artist/b513c2f2-8c25-4465-be70-67d904c0f9b7.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 0x3a5388c3abef303b19416c3068f275c91a1bdb8b4d0475fb38e5670d46247687. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/USL4Q2267463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5310a059401ec23c13fd4e6055977644c4d83eb319261c98bd04bc9c335fbf83. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/USCGJ2326775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c62d97b6c2746f9272fdc7d7612706f8460e2203e0aa5613283f6f3add8fe09. 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/USMH92398020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f5625165f7e1a29d649635775195a6457b478c7678728b7ecdccbb1f94cee6. 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/USMH92398028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa276b7aa75dcebe59df65f680221d9ab3acc76cc2e8e92a9cf86983cee8a2793. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USCGH2445653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d6cbda3ec99b291203d8cdfeae8df02abf7772316aa36f8531b8fefc3c1742. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/USCGH2445656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8e542654436f6b092a0e24054ee74f5ac6728408fd2efc6cebd1abb79ef267. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/USCGH2445658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56fcabe685c2613b6e577ab77c0ab99b2162e6a833bba0424fdfcff32259d24. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USCGJ2474119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c568495c1796a99eceaf3915588c65a150c9aa92bc657ff820711b562b9b1f1. 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/USCGJ2474121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2fba9e36635e6a859c80ce99a23ac5a87701521a0d2ac82a19719e47f8f835. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USCGJ2474122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2611f9096e11ac2f5864e08f639d4d5acb47a01d54e17448f080b9315dd6e535. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USCGJ2474123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44db25f3dde83b82e21bbc7f31167370d7de1265a14dd24181f12e0a2a129313. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/USL4R2477252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013f54524ff669d2bfeac51229f4d0dca1b407edc7e5c9dc6837aa3d15b9a107. 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/USL4R2477253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee10f5c4ff9587cc4870772e84746b37ffff6a10bac206a75a684b8de86ac79a. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USL4R2477254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dddd0a96f090c28c9a2822a593b7f917b3fa2a72cbb53d2c975ccb37e66906e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USL4R2477255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53bc49a40c96fa0d0c635e3c06862793c9c3e1466ab01cee9792376c21f31cf. 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/USL4R2477257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54bd979d0dd2c731cdc8472b84290fe5ddb060bafd599518c710121d0e31085. 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/USL4R2477260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad628e95cf710049eb113743dd4bfac71e87dfd57d5dac91d21b1ce23303f58. 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/USCGJ2559641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209d22a1933ecf0a079b2362f12b79211aefd4f86f6fd9eee8dec658267683ef. 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/QZTB82507458.