747 may refer to: 747 (number), a composite number AD 747, a year of the Julian calendar 747 BC, a year in the 8th century BC Boeing 747, a legendary wide-body passenger airplane Arts and media
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 0x76ce13db6b745ab82964ad60add2cee3ed52f8fce69b0dcec4bbdcee46566bb7. 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/60af24f4-81cd-44b6-b031-4989ae773246.json and https://artists.proofprofile.net/proofs/artist/60af24f4-81cd-44b6-b031-4989ae773246.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 0xbd56a274a2ad2a00606efd1771d5254a8051cf31d5759cf75d6943930dfeea50. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/CAX7T1500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda31d96d34f9d24b1b18185571f14cc4acc925ded03c14dff345cb0b4ff8879. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAX7T1500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611e244470d48b2753ac45e6ada9007cd5435c5e910dc834ad3371f24ecce2fc. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/CAX7T1500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4bc370ff1b8b1168b5e16a7476442e660288c6644ca82afbb80934cd4ebdd4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAX7T1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59ca38e6bed853bc314cded6ba3a06719ddafb77381da2c9e4fd36140f95c6a. 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/CAX7T1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98504717636f90d42819b841fed5634fcc0adea20ef1a3e6b653291b891b14d1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CAX7T1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760be3bfb13c8eaedbcb302b703b4b19746d0a701a2004b0dfb85c7f50073579. 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/CAX7T1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf3c5659c3fe79b1c12532e4779e4b4d9d02d2ed65e8bbbb27c635d136473de. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CAX7T1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766699aa8a78ebcd6833a6b887d4a19fb0fb92a96d74e4185329addc3fb7ad8b. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/CAX7T1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7485b595a6017e2f22926f38c98f367b7dee10171c40fa390140e2c73ed82df3. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/CAX7T1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24decf7bc4d7820f7f28adc383ad203fdccc8b38076af1aa8036e0a8b8b37b44. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/CAX7T1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54694e2e6242a08785ca91dddc8d6d92b8049ce417a5cc1bf7fb40a767dbccd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAX7T1900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfd81e30445ade109f300ded9be81a42adfe75e6a4469b2fc9e0acca631db93. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAX7T2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e55cea2859ee0833b35f7a7332ce2856bc64ac7ba15d20ea6842ecf6f9fdb0. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/CAX7T2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9a4cbeb274cac540ca3f82db0698ee61395434d7b3a02a8302d69d41bce739. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAX7T2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769cc09e6165f41c52592b1613032418bfe277f872eeb0e564f1847fe42d0b0b. 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/CAX7T2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77dd19e965be05937ce1840f6ed0fef6d48e873e52702519556ac2424c1bf49e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CAX7T2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53949fd343bee095b2f5ce2d83b7922e08f4813ae9c74c7520c0e25caaef232. 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/CAX7T2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188844f5c15d6dd77800a9e0e9ba4fba80cd68f83d0c1dcd8a84a718392878e6. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/CAX7T2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4251be15d5d6d17e26bfa006713687e888681fbc327637494f5fd6227fdbd19. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/CAX7T2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795bc9c03d04544e17c65d0d373f24f05ed58a23b531f92145dd10050f58c0f3. 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/CAX7T2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9746cb14f5dcbfc61209c0665d24efc7454c7e645f204fd7c8c696d9b9ef71d6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAX7T2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc00e8f29ddb6cd9a59df16ed35b59cc807c19dd5a8b9e42c1553e5dce100356. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAX7T2500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cf416b9d5b19bf99874a4dba68b5f3ccf9a08fcc76fa5244aad136f90769ed. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/CAX7T2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf00740d2b15a20a5d02a75514303ab8a366fb1a65b9c0b228f8c35205d72b6. 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/CAX7T2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59e658d59b761d2f2d1fe0a34332ab4531918b26f4aaa201762319d108164af. 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/CAX7T2500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3231c5318b7f152e91c2d9fc6838ad336b21e0dee5dc55b15b7a2a90858a87e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CAX7T2500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4177ea326ebb1f197477cf818fddc7ce6f264ce3ab8fabbffe279ee25f8c8248. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/CAX7T2500018.