right|thumb|upright=1.35|Whistle attached to a lanyard A lanyard is a length of cord, webbing, or strap that may serve any of various functions, which include a means of attachment, restraint, retrie
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f25bef5bb853a98780f22080242bd04bde945496f3936612e56cfe2b7c5e1e1. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dcf23564-8028-48b0-a35a-ff79b2cff674.json and https://artists.proofprofile.net/proofs/artist/dcf23564-8028-48b0-a35a-ff79b2cff674.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b60e18af88ad8096b23f036653e353ad42a34128e33b06d579728b321b46a82. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:44:45Z), 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/IT7SU2210802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5cd8d0e09d9d761f4f3608f5d576908cfeba32588f458835b44e7b45df7a4d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/IT7SU2510001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17cd5285cf634787c18d0464e6a2a906356a67a15ae1ad8f068a9e841f6d253. 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/IT7SU2510005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666048c78549dc2096bfda88541eb17cd8e80e459e03c8ed4d56b0494adb95ad. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T06:59:26Z), 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/IT7SU2510006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130355750b76dd2bc661e15d5b5b3e47409655926b4abbbf936aa9f56ed983b1. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/IT7SU2510008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f131d0231e34d12a6007ea7a5ed310ebfd8c5bf5fb2d2db2c46e33817949610. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/IT7SU2210502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2969b151e6632da0e31ca05a12bf00285e484e76288b6de6fa0ec5988c7690. 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/IT7SU2210510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b36b2941d4ae3257a4e633fe1eba24e311e71a91feca4a0445ff77c739717c. 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/IT7SU2110109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478faa46442791a6fb8d7c04b601ba51d510c8c911aa0c08ac67285ac631dd2d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/IT7SU2410002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478faa46442791a6fb8d7c04b601ba51d510c8c911aa0c08ac67285ac631dd2d. 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/IT7SU2410002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9524e7a0eccd720751491bff177d139f8e85a5bd920113afd815b50caeb512. 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/IT7SU2410006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab548e2689ff10294beef040ff471d2d805b5acf884ca220d976119cac2e8a1. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/IT7SU2410013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01725c1982703a24ea274b657fd4ca503928385211201c9af50620ea9f9eb89a. 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/IT7SU2410015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bbac8d59081bd60ae39487d4bdf81f1ebd50876c59d50412310418ca19022e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/IT7SU2210605.