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 0x1ea8cd0e1795f38b8a721a43b63b24449f24055ba9821865840994f574844cfa. 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/32c47a99-5880-468b-9cb9-32579b39003d.json and https://artists.proofprofile.net/proofs/artist/32c47a99-5880-468b-9cb9-32579b39003d.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 0x12ed023918ffc8c3b29631bbab8ba863389af131082672bd20b11d86cca5de1d. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T17:43:21Z), 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/USC4R0508399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dea559d6dd9ace55ad91aad31a7f6c86a2faf80c6b2dbf8133e8f8a69c9f408. 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/USC4R0300516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5c84e6118cdc652d94c18b47edcbfb7e29cdaae293fe63114b1a40e068707b. 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/USC4R0301885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62489b07645fbd09e1162d28289628e55ee932538a132746cf0d1e35e34bb4c4. 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/USC4R0301444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf81cb985cac800c5bc2659f313f4caf396ae40790d1ffd4f0111da0d03865c1. 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/USC4R0301445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8887b8c63d680391330183d98aa97d3cd008098d432bd00c6696c03c513ce4. 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/USC4R0301448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888b2095c620daf6e0a36eee6fb79733af9d0f4b4b776bfc30f37a2e2f40cd1d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USC4R0301449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109aa9b9d60bffa9766532b391fe41deebb06e6d16298bc35397eeca4f3c7e14. 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/USC4R0301450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccca019bc3d223f5f5b6b30e5abe5a7193cc9a0da5e00962814f2078091e302. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USC4R0302179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21cfa1a1a9840a90532ffc5858bbd7269367fcdf4ffd62d89e84c253ed2977e4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USC4R0302180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2174f1ac0231620e4018527220fc1ace574dcf4583d885f97b6907e4d461258d. 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/USC4R0302181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831f1a9cc79683f42d2375a3e1d64e6c0a3433ba2bfc1745bbf6fe176f4c9da9. 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/USC4R0302188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc403877f85b871ea289b8f729018b6552eb4f309ee5daaa824a0482457595451. 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/USC4R0302185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbcddd9796264ee30610ae35faf35ae5d0c1856f3dafd9a11bb5b1162ecf29c2. 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/USC4R0302186.
Nobody Knows You When You're Down And Out
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e877688010cb3ca942f9c9d5a6c2996a364cd1a63ead7d8885911bd6cc2564. 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/USC4R0300518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb630fb378f16c592b16d372986b8723414b84cafae0bd7b1ac87230a77f1207b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:47:28Z), 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/USC4R0302151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccca019bc3d223f5f5b6b30e5abe5a7193cc9a0da5e00962814f2078091e302. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USC4R0302179.