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 0x9c6610b0ea01815f76dd30d5b4fc057e3989c2b23d0857694486cff01f110e35. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cef6c322-2e1f-4fec-a478-5e30d7a84a77.json and https://artists.proofprofile.net/proofs/artist/cef6c322-2e1f-4fec-a478-5e30d7a84a77.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 0x3262d950ecb1f6b46c5779822176c2f03601a56d7211080aaaf96125f5a3dc27. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CAWK52417810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39e66e8319c813a7319cf2a74ab0a08378649e2c93ae4a617cce16fef0e218b. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/CAWK52417811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef6c40a3b4182f4a5193fe5c1b0586c5109b0af6157b7a255b59c13ec98c24e. 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/CAWK52417812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7a8b1c5034008832e4a788233c895479bd31f4546c8f4a0b6f9788c4541af3. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/CAWK52417813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94709bb9ff7ae9c9f3285b01b3fe79db92c21382db22f74531ccfad36330872. 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/CAWK52417814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8796259c9d661e9179eb939cf33f248881a1c5cb9be8382e38461c5a04b9424. 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/CAWK52417815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac62abe35e5bd7c64ee7f8e34cfcd660176fa3e8acbf0fc6512953225bfd29cf. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CAWK52417816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278c6806d01ff1c8da142238ce3095cf55ae3fa3f8b7072a463d07eb755f029a. 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/CAWK52417817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c7d2151ba0ccca9f13efb4a874fe96e4977d266a56dc0480c58409eaf93624. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CAWK52417818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e912623af89a822fe027b73fc986385073dc8ea982dee4bcfab70ac3d21140f. 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/CAWK52417819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7bbd28877ca4254a14f3dbec5cc857e854302c85609b4b4b666e8b6cef432e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CAWK52417820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84332d5e4dd0428cb730dccbecf2993da8a33d0417389d7caae98c93979eac7. 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/CAWK52417821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8334df36b44cb1c45b51e4f0d8517293f003b715620c15f896c2e010b8e9ec. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/CAWK52417822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f227f505e0416ff2c9dfde54dddddf445a00fefb8e66c9c26f30edb6e50e1d8. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CAWK52417823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f773db6db1765e284a0566d3a0c387c3087529d274eec88d0fea714b6ce081. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CAWK52417824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0308259345b407aa3b268c20066b37ecf9a92edc1157ba1a2cb437545dbb8eed. 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/CAWK52417825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e33df577c9e853d277e20116ac082819673e6b6ef4f685240a178a946dd68cc. 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/CAWK52417826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca148b53d1c5d3b7ced96dff535ac2cdb6b640a3373297f146d113c429fc58b. 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/CAWK52417827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e84d74210355b1ba12bfc01c0147ded163198c34e508d3fdd640e162c3b2bf1. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/CAWK52417828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c85e02e98d551428a05a8a12e698132f6118defc6d5050033793c25cb11a9b. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/CAWK52417829.