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 0x047f04b55c03b697f0066ff248e71eb5ba84a41191db29731fdbaf024e6f5885. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b1c0a72-0d79-4f60-a9fb-5635f9920fd9.json and https://artists.proofprofile.net/proofs/artist/2b1c0a72-0d79-4f60-a9fb-5635f9920fd9.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 0x02706242c5644a13a7adfa24d8fc4274611499069cba47e5e5313fbbf13aa17d. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/UK4JC1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9955aa74ad406a0b655faf4dd0768e696d931ac68908990ad2732d2c82c339. 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/CAGOO1821920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a289bd3d13d64d610483cc35f959e3e0b1d71e7ab10fd31083cf3e89d7fa475. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/ZAKB42200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe05edefae245bcff7881a29f91186494ffcbc7d346bc0c53f78781a48565cf7. 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/ZAKB42400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe6c19350c347496fb812bb4d9eb9db8cba9b4b67207e03e6863734cba12eb6. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ZAKB42400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e0bc78b9f1fea8a2f9eb40a25feac4836addf87b0f54a8f86f47a73df7ba9b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US23A1585909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70e0d7727de3271168b78991d74be27c0a5c62e86a7d6b12a88d17196f6d088. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/US23A1593208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a9d5c17de4f2e13580f5e6e99d566ef38676ec69b273f29da57819683e5495. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/US23A1594502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6980fe07926d44536ed328bfa68a67e4294e4ea65f4ec57d642da745e8b95584. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/US23A1594504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c995f83aa19818333bc44e8461928314088777f836924cedc46af60dfb1a3d4. 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/US23A1594505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80858ed355081bf2552d80852eb6cfe215b30af09e5e02cfee4af91667d5f477. 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/US23A1590382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158cb4781d348e5a5866230ed488581683cfdd504c9649facaf05b9fb648c43c. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/US23A1590381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9783c266fd8e5c752ab3fead3a83af4f0676ff62f1b7f588f360a658bda3ce68. 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/US23A1590380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd230297466b345bc54d58a5b03aff1d1c9551ad86f53013dcb8db8c9627831. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USA2P2402463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acaac4c350b8e3eafa19dd72d548c28a297f1a5851a5042e25b6ccf5d7c2f80. 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/ZA6EE2000183.