TK may refer to: People Tarantadong Kalbo (born 1985), Filipino comic strip cartoonist Tony Kanaan (born 1974), Brazilian racing driver Theodore K. Lawless (1892–1971), American dermatologist and
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 0xeb00f7b88dfcfb6381959791e7ac5d69cc14bc08c90211be041ff7ceaff62a9e. 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/e9ae0399-4fbe-46a1-9cab-5fdebaee7ce3.json and https://artists.proofprofile.net/proofs/artist/e9ae0399-4fbe-46a1-9cab-5fdebaee7ce3.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 0xa442dbe8e9288b747d5b18f4afabf9f86c5c6a40709ce9dd1133e1acbecb2f56. 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/BXAEO1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296fac21ade6372389774653b570eda91a70880bacd98885ffbb75d26f959ae0. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/BKAM92300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9801409c2c9dcb44e3314d5abd71f0177efb52941853d9c0a4367ab490717c84. 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/BXIV82018136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb999e3ad937f431dc10724dc7e52d51cd1a0cd65bc464916e9a760029fe6014b. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/BXAEO2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae2b17c11413b36456443734675d4b6378a082813e3e31c99d273885af098bf. 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/BXAEO2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15279f9ec1de2041e2591c49c3bfe246c66a85476fdc10595579f026d3a62f38. 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/BXAEO2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ed4f65e58c32a4450e07fa71aeff6d60d3cf262bafb9c44df69832d3103100. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BXAEO2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd956832ed988b8a315bce007b9e7e4d3689a24a7d94aeb97494317532fe6bef. 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/BXAEO1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e510bd8f0693c4791f8c548a33798ac3515cf9d701262aae38b0bb52145cb4. 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/BXIP51700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7578b618cc8700ad5bdfdb8eae9be48eee89d527202f3f02d14941175d0d735. 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/BXAEO2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864e4ded2538d5c47e3c7d7137e3dd8176a75b899f8c0c34f5315b4c11417765. 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/BXAEO2200008.