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 0x918585f96438d4157d4733e563deb7f2a5974486609fc8ab4a521effdaa8c795. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d7ce720-3af2-4faa-acdb-223b9f819faa.json and https://artists.proofprofile.net/proofs/artist/5d7ce720-3af2-4faa-acdb-223b9f819faa.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 0x20443e57860340cd2d2854839d640d8d908d5bef0b6ec9f9ac2a512ae64bdbbe. 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/QZTPX2590792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc6d087ae834374577293bdeaa2a24cb2a8fd54ba73b47e60fa5c0d97888958. 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/QZTPX2590790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01682097df4f6884ae498439867db5276653fdc9eccdf95a7cd6cb734ff7d12. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTPX2590791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc05bc19ff881205bcc79983986548c5add9fef2794fce35feaeffe7c9fa3d24. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTPX2590789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e81ab0635b2146ee8436f3c43061ea44c5f9806e99a85eaadffadb58e7df712. 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/QZTVM2506160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e76924c765920ca79162c9e30a48f71e83d109d62f617f48d38fac61e2ba35. 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/QZTVM2516448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6d9b82e35c8f2bfc5809a2452ffdb4c5de0ea1717f2d568aa869d5e089e371. 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/QZTVM2516446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd5e7f94dbb0909d704c5b69bfa7aaecfe44d2547d42e41a1ceefbcc305caf6. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZTVM2539689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ac183a888f5594f70da11c84271d0a59b235098baad83b43078722f23169e6. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZTVM2539688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfffb59b954b4a9b0a80388613fff3e21c0d951c0e3eb7a98c3fa6dc1d2095ab1. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZTVM2566057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ed83da90f16a5462b471a871b585b0cbbfced036caee8fd1458c2cc262072a. 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/QZW9K2505943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2641f710996e9ee1a6d09dc16771803c020136397a3934bd54d80aec773714be. 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/QZW9K2505946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe215199e52af67cc4f6f23d05781a24272ce3d6fded7f3c6471008175911d265. 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/QZW9K2505843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013b2451a01e9ac808b39b856e2bfde59a2bffbf7f441c7eeb4c2b8e5605e48c. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZTVM2589862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3addd128f68bb9d2fc26b384de1e399e5490664fc1c94d6e7eda6b11a3f44626. 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/QZTVM2589854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453bb8780b361c720fdb988ece3108d168bd00828cd1658d67ac27f1038e0386. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZTVM2589918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2818470b5385b571508ee5ceb053b214c9a7498694b97a70a99219bd2c0b8c02. 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/QZTVM2589863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c045efa82b6f00055a1a962bfd1c6965044d46709b4ef750815c5218261c892. 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/QZW9K2505823.