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 0xf9a7ffecb9397621092bdf287c656df7e07f0f5bea52967e9e866f3afa6153dc. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f502b6b2-9daa-46c1-8440-d5d503de945a.json and https://artists.proofprofile.net/proofs/artist/f502b6b2-9daa-46c1-8440-d5d503de945a.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 0x9d91d6a849a61871944c0fb7d5cd1419c6d473c6becb22e40873be170a56e320. 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/DKVV91200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc721f4e705233b336a268add47cc8d55c3c26a64754b79839f9d674ff85664b8. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DKVV91200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5eba4d913d0541afcbfb020d47f94b5726f0ae75413b5bf1602b1e96e1f1e0. 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/DKVV91200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00becd994dc3c01d5b9b9ccdca6fdd912da03a6e20bbec9eb58495439b835ee4. 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/DKVV91200104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7ce930021479365eb096d09ef92d831cea7e5acf0e93ae916a50d5c896bb7d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DKVV91200105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc824e9b59b728bc5810a866e153b293050c601217e61b16b056eb6527a67450a. 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/DKVV91200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9263f679e9dbfae47511aede65e134c0a2c3ad307105b3a16de206b6984bdbb. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DKVV91200107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41bc83234ffe46dd77668bc89eac0ce1482c6de0e7255a6ae53d323c8fdd165. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DKVV91200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27d086dd9ebb6793ecbe871f7c0109168df2e578466193e109e514a74b3d112. 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/DKVV91200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512a692fb17e37edf05a03500e3773a34d7009b262b2bbe403697f3717440249. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DKVV91600101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd97bb3f999daf86c6176a706812b7b935e95ec5f6786741ad5bf2656cc86017. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/DKVV91600102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda45c81ec7fd38fa6e938e3ce57ed2ff800016d18d42d5e5f10963b6baabf2d0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DKVV91600103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3254881281b7afc35e6e6bcca9d115ae52378126c5f28113fd480decfb08f51. 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/DKVV91600104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8941b6a583860e2370007cb2556262f33caf6e00ab3ffb72547ea7c5e09f1d1. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DKVV91600105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb87d3b8c85914d6b55ee889bbf4a5b8c0c935d342cee8fb440f07d68c6e3f6. 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/DKVV91600106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb891eebf4f6c2feaf29f5277e1caa059a6d9ee583643078d9ffdd882cd119cc. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DKVV91600107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b49f2a1e3d9b5a3863b4ce6c29275b22a227ccd453e86b115f1389fec827ca5. 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/DKVV91600108.