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 0x555afb3c68e27e56ff1c9788dc6cd1817637d209a58c0322c7bc99f6734ff249. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80de5f47-de45-4107-b5e8-5f2360f1b59b.json and https://artists.proofprofile.net/proofs/artist/80de5f47-de45-4107-b5e8-5f2360f1b59b.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 0x2d3ebdb652ba4fd80ddc42b343d379ace88a551f7f23b5cd7875caad6c1191b5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USL4Q1724963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc080a7b10acdf574c86b711cb4c19df087c691c93bbf8311c4597a28d9905cef. 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/USL4Q1724964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc4ecbd9db5deb4fe8a54d84c50fa5631db4d39c62934471c57da8faea886f4. 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/USL4Q1724965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d312f831ff66a2a2cafb9a4f2eeb835f84021350a724ed72134b0f652ea98a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USL4Q1724966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5253c2b177319a3514337827277607a791f4421d599f10436c4ec753cc1f9de9. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USL4Q1724967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa35528449b6b85c52c6949e0172b72308e2f7fcf1db61cf716969be7ffebcd6. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USL4Q1724968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8207131ef7b7d14bce7aa729d41701b15c095e1626f022df0a681d2b75ae9c9a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USL4Q1724969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7424cdcffcfaebd879155a7a07c30b82336a9635ac5b7754a41a94678bb0e489. 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/USL4Q1724970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d23ecb1195481ecd4b28a2d0b480e415dcf3f4a0d5ce20b4b12f45bb0b2e3ff. 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/USL4Q1724971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6550e7ccb9ac9455962b897d34536ced14d7f800a74259a2091c4ea3ee6817a. 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/USL4Q1724972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a20c9b5746f55a2d323ae2fda90d2d3b0418ff3e7ee43ed30935fb7e708ed1. 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/USL4Q1724973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428e483a018837955c2c9da6ad37df23bc71646ef148e944f0b84ca802750b9c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USL4Q1724974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfea2bb2f1f1cb3b6ad48fa2fc403ec21876bd26fc4abe09c13249d9e145a149. 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/USL4Q1724975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2276c5783edb2f656998ad8e1608a69264f05e2d08ee1ccb85777ca669551f52. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USL4Q1724976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd748112c21cf1020417a8e19c0b18e6e7cfeb0f1f7a3c8d207a6afbd7c44d2b6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4Q1724977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b7d80b7706aa49383b6b23d36192a047b8472daefff650ae66fb0f27c7df37. 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/ART0G1807109.