B4U may refer to: Broadcast media B4U (network), a Bollywood media corporation B4U (TV channel), an Indian satellite television station B4U Movies, a television station focusing on movies owned by
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 0xd190e5decb7f5ff749ff3fe6e126df046892c0b13dc3da8994d6286e39e03d82. 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/40427314-15ea-40b5-b53a-cc7e43d7bbd2.json and https://artists.proofprofile.net/proofs/artist/40427314-15ea-40b5-b53a-cc7e43d7bbd2.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 0x7144a9013aade405a77d2d3fa64958b9374d14ceaa156c5d78b3eac0f4c92849. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZNWV2354513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699ada6ce8f834d8dbf444e2dbdbe4a5ebdb91afcd0d1e03c7fce7324a87be69. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZK6L2368855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ace58a5424c3e7d35b3fc18d6eeae5f33d30c7bb013b79027ad6977bdbf0fba. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZK6N2328132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac024e94438e8c4a53761bffbcddd5075917d2645985d6e7f18a8f226ac09f03. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZK6F2344285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46e49bb1ca72fba604801f73fa1fb98385b3d6fff030b5670871977f2bfbe67. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZNWQ2303778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87bc5aa342edcea50bd4a893b00ecccd845bb886e34563ac95a16dcaf371adc. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZWFM2308605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c725405496b267b8c4a6d69eedbf827220382397216dfa284b9d4b1426530e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFM2308606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c295b4083c6ef3b999e8a963cf67646933ad8ae1209a511f4099aca49e861b. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZTAX2376672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c1063cc636774354db21eb4972722d76f96dfc5cdf0064471d361d9ae2cbdf. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZWFH2376977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0cc2de0df617503c3ce7a111c459586a01cf75008428a1045b14de5b01b66f. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZFYZ2470986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab0c919fa8f373f595ff05d3b87d5bfee9bb77ae559363891d60a99a0c35d6b. 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/QZDA82477236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb255afd5df86fcf1002b4f5f2ba77213da4678cab25702b3e6921d2da6b8ba3. 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/QZMEP2443126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab0c919fa8f373f595ff05d3b87d5bfee9bb77ae559363891d60a99a0c35d6b. 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/QZDA82477236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e2f44f02b4a16ec43e5da38b407fe6f092ba05ac46270c69fd68921ffba429. 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/QZHN82466955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a9205b646d1d9c9212ea8034c867d0c0b1589e3067aec74d6442eef47fd106. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZTAW2458541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ec42b92fab55a72c6d7e7476db034c4f3d2f9d46381c6a8c8546b2093491fe. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZFZ22507921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1853066c82c16c5e36fd1b29db3afb06ec1578769eb54c8abb206993a84601ff. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFZ72590070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd762e1566662f293d72df8324d65f03f77095204e1263ec4bf5d928b7b68ac7e. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZDA62537255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c15a02f33a6570e9416400c8898a5ded6d68c43ffb622c2667b0e30524c22f2. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA62537256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50470d9c5b8f2cca7e2520995e34b1796a37148efc278df5347d80282f7cd214. 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/QZNWV2506031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350abcd98d4e2a09a119dda6f3884b9a6c761de4522d24053dad885321dd742c. 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/QZHN62521456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ec42b92fab55a72c6d7e7476db034c4f3d2f9d46381c6a8c8546b2093491fe. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZFZ22507921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf695434628dc5f4794ae09cfd9cca37018364a5382c749bb4a779fb1a786f83. 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/QZNWV2506032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937a47d58acfa759f1151c89d5bc751d6a41f97a4ec12aa1d72fb6df367df56a. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZNWV2506033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1228797b43d6bf4cfee9f961eae730b9141421a81ff35410cb3fd7486fca65. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US38Y2569458.