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 0xf43bfcf05bc0ce675a25d2a6d522e3f8803133824e70619192be65267c96f06b. 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/f9dd9dc8-ab31-4f60-b4db-4e057ca9a0ad.json and https://artists.proofprofile.net/proofs/artist/f9dd9dc8-ab31-4f60-b4db-4e057ca9a0ad.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 0x517252f8891a6ee05b18af148e77470835815db64f192a028bf085e87f790777. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/SE6SA2447595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1147d4cc36b0e4ca9c90a8adfbd534a4ff1839cc0f36afeb54823b18e562eafe. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE6SA2447599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b30b6612594eeca7c5570a76a828b097a55dd55f8234bc07a2ca5a44b0bef78. 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/SE6SA2447600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4e7f46b717dbfb7b8885e9efb9b1d73922645fb132aa2b35902dd942b8017d. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/SE6SA2447605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229fb0c76ac3d0c6606a18086750ce641495155b3ae2b85462d6723288bd5077. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/SE6SA2454906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfe395eecc627d33e6fa07eba3399f9a213da3037f4488bbb9792d4acebe07e. 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/SE6SA2454908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d18933502882c746c521bfa81db1e4197104fdc850bd1bd9be48e994758d2f. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/SE6SA2454916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e513d9223c331bce388b73d127fc9b542c0d1ce648941e16b9fa6c9e3102c7. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/SE6SA2461737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f57ae7bdc64f16417d5220181b4eae9091a135ea6ae4290a72b564a2d5848f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/SE6SA2461738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba76561def92f4ff999bc0245910b84bbe39b46339f0738a9b2df41fd0bc82f7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/SE6SA2461741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0e2aeae6a68cfe5f9e7090b0f1c2166f3d28c0124064b31fcbe4660ae48395. 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/SE5BU2511948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491c4d40294a7a8ce610d9945863bb7d0262e0082e25fbca18c11034041d56ab. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/SE5BU2511951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e28c7f29d440a008e776a59e630261c02b5564e75d44d015c39e1b1a1846d0. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/SE5BU2511952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafddfa18b3349484d29da291fa919058c19d89470e2efef48d5312cf3fa159f4. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/SE5BU2511954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5d3b7bd30ad2b9bf5de082848c4a45ed63fcddd0c10e46280204ddf1c54566. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/SE5BU2511957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4938f5207bebcd659accdc069e2bb3417b64b10ddbb209fd3f0cd13715754027. 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/SE5BU2511958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ea9119814ea827a53a66d17e1ab0ac57eb248c67b70065abcefc22cf452986. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/SE5BU2511959.