Den may refer to: Den (room), a small room in a house Maternity den, a lair where an animal gives birth Media and entertainment Den (album), 2012, by Kreidler Den (Battle Angel Alita), a charact
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 0xdae1176d3bc31fdd5727e492ba060ec11e7f147a3f327db3c2b8d301fa29d0b1. 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/323ac108-5c08-4bd7-b4e2-f92696fdefc9.json and https://artists.proofprofile.net/proofs/artist/323ac108-5c08-4bd7-b4e2-f92696fdefc9.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 0xfa32c01df70ac97a98df9cd924db3a761550092baf95436aed7d5fee12ca644c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CNC072100496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff11ade7694437f0724c3c64250bb7e34d9c97a7fb2be82f0d60cc6f71e2a7a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CNC072100497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1e019196f37f90f5d508af4a0b7fe1d51f64a20eca4ee6b1591386d2831c31. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CNZ681900264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc330060dba45069934ee94a7e149ba0b51e51d5544c19c03e7cd3fd85d4ea047. 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/CNC072100493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6f89c5461f9f67eb9c8c323326d0849e5a4aa6cf81be4f195d0ce394953336. 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/CNC072100471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd99a2a0c2fec8006e6813a239fa7516f4502bda4b7287c9641ed9d591bb695. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CNC072100488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83bba0baf67d0371c0e61db916c7ad57c8d792a4629fc0fd1e79bce4be46a4d. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CNC072100495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82068c48d0f2bd79dec92bdfc46b817af7e209a2ecd72f1c920fa3e328066c0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CNC072100470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd09db04ea285ca65fd477a4e02c01e6d7c0b07f2b9205a4d919fb94278e2355. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CNC072100469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109fdebfed5912372e0e6583d53d76f2729357d045d19452624600302b07ea00. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CNZ682000232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e46cc4d67a23fec009d1d3ae2cbe6b576ed969743ffc2f709bf4f155fe5dec. 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/CNZ682000250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaaffcff3302d6e328d94ca578b247c287e9c4faa0244efab58cbf3179810581. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CNC072100494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0be6bb88a0e4d8aa4bd06015840ec2e2073ed5a59ae67cc5d0e6e1a9de1bced. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CNC072100472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbc32f60950fb787319c4001ef516c1db6e52c1ef9ec3e9fd2d8cba1123c216. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CNC072100507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66caf9e0a1798d4059a5eaed265f2d6977cb1c22386b1902406e2bb2d3bab2e4. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/HKG731568097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14136e682a7ab39f25a8db6c9517824f296a88453288f227f96b035029ecaa8. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/HKG731568147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8bee26ea9d1ee8bdfe8aa4f6697d9020112233e0a54cc791b3fe0e91cdb786. 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/HKG731568700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762b36b7ccb21ab988908c3a7a1e109cc329ea4e0b3a3a99d4518bd4436dde3d. 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/HKG731567885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8b01c2ed3a889a69c5dc78f64a52725fa7f102f3e3a49b7e99114ac89ee161. 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/HKG731568841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96dad9cb644b9329ca873d3a2c9d45a39663b322e53cbb61f27f5330f1b8d78. 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/HKG731567571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3fce2b6e4cd08d99f6573a54e94c5b647b85d8e6180650df5333c32e01956a. 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/HKG731567894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fcc16d578562b496f937fbab3a9cfc7f1a4dea9cc828c65f7242cfef0cf805. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKG731567719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cd659123748aca68b9bc0db2235141bd2e5d2a8001e8aff72e80935c336535. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/HKG731568315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b699eda721a0e89029af07b4d0b975713cfa7a5a15c87003a5014150c01d0f. 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/HKG731568625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdded25dedefcd7e87724e84ff68516f59ffb8b74e87be5cce8e1485c8313ed46. 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/HKG731568738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7349e133930e229cf5662fe700af22140189da853be3524efa7d786e071b1b4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMER2440131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c69bf2cdcb9bbb0af079228dc2a236ef9d16c0fb869f208bb6b260b5fd74c2. 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/CNZ682300257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c6fcc267516e01abf844889cd4147235b5acd3a262a6ca4dbc05f0c83d7596. 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/CNZ682300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e45ee5d8ab201e3aa8ad7178dfb165a771954b6ddf24f7222058f802d961525. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CNZ682300256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c247580111ecbf436e802a0feab46285b8871522d967e3890dc082e5ca2e9f. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/CNZ682300114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8218821ad776999107a9dad29fcb72c6b51753c9d6ec0e4ffe4881b09f5f0ebb. 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/CNZ682300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8bc784b213496eac278b462cb277444b065b2c5dfee69fcad79cfe95f1359e. 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/CNZ682300255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf63e334ad8d78f6359819e0167f9fc9e0fad26ddea75395eb23ab469ba173bf. 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/HKG731684112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c247580111ecbf436e802a0feab46285b8871522d967e3890dc082e5ca2e9f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CNZ682300114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c6fcc267516e01abf844889cd4147235b5acd3a262a6ca4dbc05f0c83d7596. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CNZ682300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce6c28328510858376c874bb5dba91ebfd43d924a4576958e3e065da873dea4. 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/HKG732499288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb016ff989926ead43d62cac599cadb2e1d15510719450a494279fb5ae08192b. 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/CNZ632401715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e27c56e9dde9da2ee3dd628cd18e4bf5b2648ffec4cfbe269e80fd9320d6286. 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/HKG731401796.