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 0xf3d9a7c90a5378999f93da553fdd710c89aea5e9fb40432e15d37a1d97c7cd15. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/489632fd-0a9a-4037-9186-b413e48f018a.json and https://artists.proofprofile.net/proofs/artist/489632fd-0a9a-4037-9186-b413e48f018a.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 0x88cef0880e68ca27049645df161bad2a28666644005b69cf07c7a477470db3c2. 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/ES8000601101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584b8a6bfad021b5beea961df55779ca73d9d7a0d7a6c875fce6f96946342ba8. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ESA031210701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b227edf026019541f95179d242e6c9cea7e721c6be697c565f3f265ba8186d6. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/ESA031210702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72d9e4ff717f94e443769b026e2ceb166fee85133449c9ea035ce34089ce9ef. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ESA031210703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86ac77eea928c84774800cb083cd0f7f39854e0be6d2408bc174a0a6e695e9b. 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/ES84S1800620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081f08d9ef6cc82194ffffe2c12ae502e6067a3f349ed04c250ad801745ffaf8. 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/ES84S1800624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf504c762179be6711073ba916c632712858741026f58f9d65622659535356fbf. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/ES84S1800626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dc1eb6bf7aae89d2bce99880ea2d5c45172968525d07fc2ad8adedc581bdd1. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/ES64E2506036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425eeaccd1704d2909cbf313f18b53b7431a9d64989d219bf27de96ccd24b9f2. 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/ES64E2510593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dc1eb6bf7aae89d2bce99880ea2d5c45172968525d07fc2ad8adedc581bdd1. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ES64E2506036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425eeaccd1704d2909cbf313f18b53b7431a9d64989d219bf27de96ccd24b9f2. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ES64E2510593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652860f289fe3295b2042dce40ddf36501ab58086e201dd5557c5ed2e238dacb. 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/ES64E2507206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a11d49f7622af1d7ed6a3d3306ded0b3400af890322aa07af815b34752ca8f. 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/ES64E2513525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cbbb1933bf256ce5ad1aea13f4236f052357ec5cfb49472d42d2a97dd1cd63. 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/ES64E2513526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd507d6d7113bc6829957a65d20a07775a30d543f47c1e0f7d9141e80872d4f05. 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/ES64E2507940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd793f84d50fbaafa3aa6cda0377e6b33b513e3f0882865b839f9f3524a972d5f. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ES64E2513527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072803c7161fe888a53752ed89c8ac3547f657e097e5a08ec3338ed8d3969c5c. 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/ES64E2513528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216be4cb7181689df8cfe195b4fd6596b8a744261a78948026643adcd95864ba. 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/ES64E2513530.