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 0x87dca331fda21208ac819e3decbbfc9ca1a8240c82e2f02e6cfdf9bf088987b9. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17b999f9-8c49-4f2b-a2af-047148251bdc.json and https://artists.proofprofile.net/proofs/artist/17b999f9-8c49-4f2b-a2af-047148251bdc.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 0x4e7bf88c7fa7f982efcee7846f14466c92da033b7f76f1d63a354076d8266a85. 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/ITM692060159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb603ef9557b675712f0259a8413c5b9d32a5c09c8666eb44b389a8a35626a902. 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/ITM692060160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686752777c99fc706a5663e14b1a8db3313a0db21d01d44a469506c56a521dcf. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ITM692060162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae65f3376f25cc51a385ab32b359cb0467ddb633b500dfbcd2ba3da9d15c465b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ITM692060163.
Heroes Expanded (A Tribute to David Bowie)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c691f1f614c04c6cb8d1a17ca25eb47e398be521aa9b8c8c2172a50a7363d37. 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/ITZ682100301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3127cb395577f3052fde7b9c3ff189475090dacafda9e6905963c32fd70e64. 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/ITZ682100304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1226aa1334bb04e8123994a4db2c369c3fd74dfcc9718f35bab54ddfed62042. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/ITZ682100303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ccc7c58187d57cc429dda5e1a71ce78af396475613299805038e1a2c71d528. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ITZ682100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fad87e6c55337198391872d072aa3be30da7ec191ad99c0d25dc3bec2b7a57c. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/ITZ682100305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68fdca419363bea6119f360a83c180e81d714ac06cabc6c3f1cdc4e14a416096. 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/ITZ682100306.
Space Oddity (Ragazzo Solo, Ragazza Sola)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74192b979cce98d3b7e7fa4ee3e79c150b12891c0f74031d40699f01e59b11b3. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/ITZ682100307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae8359ae9df967c5538be32022f4f175c6d4e40c581f9c8982fd47e583a01a5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITZ682100351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750740cb73a1201b1fc05cc7b41e102e6c89c0f762308c972dce557d234930f2. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/ITZ682100353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ccc7c58187d57cc429dda5e1a71ce78af396475613299805038e1a2c71d528. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITZ682100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1226aa1334bb04e8123994a4db2c369c3fd74dfcc9718f35bab54ddfed62042. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ITZ682100303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fad87e6c55337198391872d072aa3be30da7ec191ad99c0d25dc3bec2b7a57c. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ITZ682100305.