BK or Bk may refer to: Businesses and organizations Burger King, a chain of fast-food restaurants The Bank of New York Mellon, the New York Stock Exchange symbol for The Bank of New York Mellon Cor
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 0xbcbe2217b8174dd79b504b5abc967eda97442049383620d23b87d183cecbbfc8. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b11e769-9bbe-41dd-a623-34487f80cc95.json and https://artists.proofprofile.net/proofs/artist/4b11e769-9bbe-41dd-a623-34487f80cc95.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 0xe80a5d375f64b08cc054011856171511a0be013f7f4d42d2bd43155c21110df5. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZDA82513959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf47de9cc05c3caac6bb12bb3aa58e9bff55fa083e14a149dafb149bdca9582. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZDA82513961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621db5b487fef64ecb14de30bad1359caee037268cfca7c61199582f65b8d998. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES72555262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d508d18f5e62591d6950c62dcff3e4a4ba45d73e275ce48254f1f4ad379c93f. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZHN32550333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a781b44c1fb53264adc3c4fed752c09db0682c4bfc7109ff5ed7b49c913b896. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZHN32550335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc4e7b4e456647a1ee349602525c72351577fcf213065cd1954c48fa2451a6c. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/QZHN72581252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82472e17079ea97ad3cd5c444996de8941ef3f5f000e2f68ce1880ef6f6ec1ad. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN32550336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b42a1d5141e4792c208e8bce7c8efdc54cbd3436957fde4d7fc7dc69ec7b79. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZHN32550337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b05ed20aa4bd092ebef89d6574d5a45c4dd5a48689fdc1896079dc8fd5f667c. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZHN32550338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0111645db6cdbf841a4aaf79d01b62b02740a23e4c9a8ba57bc64aa79fb7434. 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/QZHN62566791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2941c719861a6cc83e0fef48a8585e5e3d5f880bf762e1ca75799f573c1dd71. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZHN82583969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae255cf6ad0ca71666553bc57f5fa60172f6be0ac44551d54e49ff52a5282ad. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZK6K2515355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe623f6f6e9fc4e7312fa63d060bef36669b1f43d9b0574553a06bbb0c7dd5606. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZK6F2552380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce582e8a6a03dbf3c48c47fe71d1aa74f609ab7624fad948627cd4339239f807. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZMER2555968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349b95d7802cb2869a4b4b28965df36b9094c80e23f2bb122beff8762b43425a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMER2572771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bca980f228ae6623631433906cd15f556b44c3f4ac4060c1d70cdf880209d6b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWR2544313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582b787c525603ca46e2da30e3a36e79fb46a69b35df54b18ac18b6d4d15213a. 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/QZNWW2541602.