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 0xc4651056f82881863469e1526867542667f612fee8cff2e113bcee4830c2b4ed. 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/dd3c5f02-7e4f-40e2-bc74-4dbd9efdf9d2.json and https://artists.proofprofile.net/proofs/artist/dd3c5f02-7e4f-40e2-bc74-4dbd9efdf9d2.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 0x418ec3a90227be90d0aa2c887fd0dbcd669f20042c173668469396edeb5a0808. 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/GBCKG0701478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d5afcba855ca21dd8d3b0baaf3ee4cf309c43639b95cdbe53170aa273a954d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBCKG1200185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc264a9715ea6a1469fb0cf8ffa7e25a60369730d40f3518ae87408375a52b5cb. 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/QMEU31619411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42dcf42eaf877c3f1f3a05bb39a8c6c57627d1440e02fe071d2f887230c94c1e. 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/GBCKG1300282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e91211d3e9aa7a548d5d682da1d48d2a988e52aa146fcb605012bbf671516e. 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/GBCKG0501580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67b94d64dcec0e944c143b973b171ef72b62e72eb518db0dbb3cdcb6315ef21. 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/GBCKG0501634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73899d1d3d0d6e37c8bcc26aef4cc9bda0f256546d16c36bf578973c727fa6a. 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/GBCKG0701484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a97cb1a1ac4f893aacbe44d39972de445f10fb896f89ed9ccfbc3e1b16fcae7. 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/GBCKG1200179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d610875a4b8b90a185201af21ffed45d5eb5591a32d44402ec44852df9c5295. 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/GBCKG0501584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616d6e9409095772b3875f14b661888499ef4686bc53071dd81cddea0a56e455. 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/GBCKG1200186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82ef88f1f28e801d4ad8f5750c8b76565cb4e1c3956219b051307daed03fdf6. 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/QMEU31619407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418ec3a90227be90d0aa2c887fd0dbcd669f20042c173668469396edeb5a0808. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBCKG0701478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71404fb6b95998d86c42034c0aa4dec542c7bf77a527d8a6215bf1bd7219e293. 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/GBCKG0701480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73899d1d3d0d6e37c8bcc26aef4cc9bda0f256546d16c36bf578973c727fa6a. 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/GBCKG0701484.
The Wizard of Oz (arr. J. Carter): Wizard of Oz: Epilogue - Over the Rainbow
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f9de69f085ed5bd91e7953244a393d27edc091b9cf237035e9248f8747145e. 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/GBCKG0701485.