thumb|upright=1.35|Depiction of Sleipnir in a detail on the Tjängvide image stone. In Norse mythology, Sleipnir (Old Norse: "slippy"Orchard (1997:151). or "the slipper"Kermode (1904:6).) is an eight-
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 0x2948c4117a2b1e8c5676ffdacc0b2bb9dcdc830a503c8e7b7dedff9b4ff3874f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/617d45b1-2027-4c0c-9513-53a97ba242d9.json and https://artists.proofprofile.net/proofs/artist/617d45b1-2027-4c0c-9513-53a97ba242d9.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 0x5371f00acd8a733244073353ce33e1217d09fe81527a75c296d5b475b44da94b. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QT6622582605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95054826298aee28faf0991e3eb631a19d43773109d9f5bf9ae34948890b89ec. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QT6622582606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee35ef06dceca37dd2fe03683f6e7345e9ba93e84f19a0a9f52ed94a92a71862. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:45:42Z), 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/QT6622582607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89d6343070a4ee36064cb3d0eea67ae3507b36d551ad422cf55abf4fdbb19f2. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT6622582612.