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 0xaa1055ac88c5516aa2879d68062fbcc5aa710a07c4d3a247f84c954c9fb845ed. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac66816b-1fd2-4c8f-9183-d8e40ecf0a1f.json and https://artists.proofprofile.net/proofs/artist/ac66816b-1fd2-4c8f-9183-d8e40ecf0a1f.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 0x8522f84c9e7e4106f04631c78ddeb31905fe624a765b2dad76f041ed5b52bde2. 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/TWA539225801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510bf90f029803dfdb259e0a09c44a42d8f5fe229763b1a022b8489d92177fc0. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TWA539225802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb62b34e47c65a0dc140529c3a85d3668ce328b6ecb8c745a6fc76f992ee49e. 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/TWA539015901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9a8d9568ed23a9a8f53fdd5385e547ee6a3128113984543152801454a652af. 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/TWA539012203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47659d3bac296a2a10d6760be3446a862025c0e5322c156188d7d6c4cccf9b97. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWA539012207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0937fb86d701ad729584370001f72d30ec9ed443cb0f46eb877d96a15378c4cc. 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/TWA459546201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7648b119ec5852fac86b72b1e58756e3f3dc69e28a9bd7e3d3098e6423998913. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TWA459546202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35e90eda7c36ec5d86cb1a886d563de20406a372892d34d9f5ed4a17b758d43. 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/TWA459546203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c31e91bf80594d973c757e39c60b17543f9a3577559d8decfed29f631449bf. 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/TWA459546205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841fb90a50ceb5d4b7c2ec69b571a21e5a42b84b209332e87f38a1fa4ae7209e. 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/TWA459546207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef7b47f1dfcb1c67a43c289aa477841812f2b0f644a2bfdb0727d495b3f5a46. 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/TWA459546208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6ed630f4ca3b8e8e6ad85a3bcad846f4bb9ba5422af1aa2e9b8090f7de95b4. 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/TWA459546210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a63c8704bc2153963f23767833c5b908d0f3b2c9c4cfbe85a85738c560508a3. 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/TWA459231701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72df8116f0fd36a84da743942ed055266350cd68dc76a0a570b2c50a6cdc875. 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/HKB629400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e643757828ada2bb82aaf9dfaed66b267e740ef40c95ece5dc46d2bf8c3959. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/HKB629406043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4678d9da76251cd4cfdb2d2a86b27b17b28363a37e7fddb76114ea8bd893aa89. 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/HKB620300262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84729ff7bbac31ced81af449f477ec9bea95e8e84802e5d98163afcde0bdc2c5. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/HKB629407008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce828f0eb23a070dc0fdf1634a7717af81bd519f10577a69e88ed63aa966678. 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/TWA459440801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f9f27d2b24d8dfde44e4184372ee85e97cce1106051e92dd84f61c48bedef3. 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/HKB629407017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e72816149a94b94ab5583abe5d1369316971a10ac16362ebeecbc6e5179ee2d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TWB839441001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f10aceed366ceffb8bd37a7b8607af86e3cd5f0dfa4f57ddae6b958e21d5b2a. 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/TWB879815023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0bae3d9d63ff1dbbdd79e3a9ecb514359b0e1bd4adc4d462738710741eb300. 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/TWA459442001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b9e9a58a3ee1a95f67d789cbdc3b5a9a73e1871aaa29cad03650af52158352. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TWA459442009.