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 0xd86052c30af017445c26bed3a5773a82790a71b8c2a1df0177feab41df8597cf. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a9a5bc4-5464-4d5a-9a9a-8ed860962c72.json and https://artists.proofprofile.net/proofs/artist/1a9a5bc4-5464-4d5a-9a9a-8ed860962c72.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 0x3dec842d1ea2f5936675241d26013816cbc7b1b4e4f6fec2c7b5fca06c1bc425. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GBMA21996782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa799e1db9dd0a1b8e6a3a70e1eb34de4a86da1fee3b9c40ab2e582e9213c0cea. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/GBMA21996786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dec842d1ea2f5936675241d26013816cbc7b1b4e4f6fec2c7b5fca06c1bc425. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/GBMA21996782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f346a86eb33431dba8c14ebc6aeaf6f51cac7df72edc15b1b3b696cf0d507d. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/GBMA21996784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99d8675dce53f2bab75d4bfc04e971e52b70714706e9aae813b006d2661ec8e. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ES71G1509322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f83818faf6d57a58f0a133f4a536eeb795c9368456d2a9b2589c6639f9d0c08. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES71G1509321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1595ec491e0b27823e834b97278495eb13ffa29d85b5b65c73d6c58abbf1b2fb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES71G1511872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5917b33ea29133c15f2fcef9a87b0959838d3b46e6f7888773fda6b5a1ab70ad. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ES71G1511877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d707acc33a4cedae9c63d0bccc116e06a7d402a1335f4ddfe0d31a0dd3b666. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ES71G1511879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89bba3526351677c3c9076c0ecf3114eada7b754fc77bc996939c33c9e5be9ac. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES71G1511880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaad850b81cae6cfe103832059ed8044c34aede7edbe57e111d25165c4bf8389. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES71G1745505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ade61e1af2dcd5a782ceb2d75f14c64230b016bca1b2faddc7e2391c823f45. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES71G1745507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c41b9c4ef994c90cc8731125d0c9d2df333148972ea17767d87b9ba84c4335b. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/ES71G1730520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79fab114592a68f1848f63a16b4a14b8332887c34c6cfdff1e0a92409e3f591d. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ES71G1745509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c351536bedc42d0e4be1715bff6a5b0c5fef724cbc7eca2e750981887abf39. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES71G1739413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a9c363d7ee6ee8ad9aaead055015b6b6d35a87446f9808bad469ae1b168ee4. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ES71G1745511.