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 0xc1d3e0701744ac239cd18b12914a9b2a56054a7f4c4df4fc00d49fa2c6df4fa4. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3ad7246-13da-4949-9b99-42eba340286a.json and https://artists.proofprofile.net/proofs/artist/e3ad7246-13da-4949-9b99-42eba340286a.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 0xea0d8fdc3abfa5b7a15da95e010b35a1c580901f410fc2146f3f536072abb8fa. Chain 2 (Bitcoin): anchored in block 957674 (2026-07-12T07:50:41Z), 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/USHM91701447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe705ae2eb8828e4db00aa0b0c3f1d8adde526b61222acafbc4daac85ca255480. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/USHM91701448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94467e45df634b78b40b8d62b4ce3b18f5444386b0131ec8a01d55396e72fcf3. 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/USHM91701449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d0ea28e80693e5b63d6d2cace2dc4c4bac6993d88413b922a5ad7a7afa2da0. 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/USDY41872878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8cb18c1ed642cb46f03fcebe744ca1bfcfd990822ed24e342016b4b5ee0b07. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USDY41867913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3069b83a253e0dbc31be0a79fdb43c73e4bbf37ba09690c0f03a382b36a84619. 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/USL4Q1813991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0625152fca63ac8647f4e6a521920db6a17f3c86badbe013f3c6d38fb39f016e. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/BX0BR2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa760defec2dbcb4492945884dfb9d4d9b3c5948f1f3982b4116fe38360d87c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/BX0BR2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ce0645732625d129182a8056d04177f4bbac9e34c2d00fb1eb67aab29e5929. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/BX0BR2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0625152fca63ac8647f4e6a521920db6a17f3c86badbe013f3c6d38fb39f016e. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/BX0BR2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4425ae237b910afc7f53876eb3ee54bf0d43547ac6a083af3e309d20c5d3ff98. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BX0BR2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe804b25a869aa3da974d5b9057c2eda4dbfd271723260eaba46447998832ee93. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/BX0BR2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2af46a93e5cde46382c4e24c20694a66906a5572f1849de82310d8358c5c63f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/BX0BR2100001.