thumb|Sharp-shinned hawk, a small member of the Accipitrinae subfamily Hawks are birds of prey of the family Accipitridae. They are very widely distributed and are found on all continents, except Ant
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 0x3491efae78da9c1d9a32f0ad452112d0e9d52a143b880ac4189a3ac1e86a751f. 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/f2593efc-7f56-4223-b43d-01304fac20ae.json and https://artists.proofprofile.net/proofs/artist/f2593efc-7f56-4223-b43d-01304fac20ae.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 0xd32522c361f678b2eda90e128c65806fc3f1ffd987ac74e7dd255ac9e38cd66e. 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/USXQS1300303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72673204aa1350480dd71b41435881aa5b307b98cc39cd1f5c0556f15c66cdc9. 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/USXQS1300304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3db54bb5ac926c05894e3bd0b2e1d1d5942423599a37430d2fa397d1bb2a20. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USXQS1300316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5103907f9c4d40346b72ef418afe2d899f78d9b3114dcd6aa0a6af86dc32e8. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/USCGJ0621778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26832f34eb97899a54cc2c12b9c474ec0e7f59b245459b1a7532896385ca5bd. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/USCGJ0621790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8125bb8fa859638f112308c1e31774dfff3df6b80b78b423d070b5b3f1af90b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USASN0700573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8297381321b7ee6b25777d37b2376605a339f20ddfc12acf8aefa733d8ea7d2. 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/US7VG2315319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd36f52d44a313b574708f120972870f212d844a79fb860c7bd4fbdac15c0c6. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USA370947409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d688c88903193df102aeb8a1c97c5c76ea377ab23d0f340b644c75e89605bf. 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/USQY50911176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0bba83c6641e3a6e4b37f1d1099593c27aa2910378a1a3696c8498b3cccbea. 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/USQY50911186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49e23c763330640dd78b535ecd1b3853fde0ac61ec5b37855c85cfd5324858e. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/USQY50916400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c969e00530248a7a1784621e1ef782d07837699264378c96c10a9fa5d431a3. 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/USQY50914089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a2adfdf1d43ad0e1ac6e5768320778576d125590fc956e418c03c6e3537031. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USQY50914095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b59623c9b7812f7491e8f00b0002a45880b03086e255e63eb94ab6730be0164. 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/USQY50911208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888d7e57090175408215637a85795800e36fcf056c3036461aefa874f01473b7. 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/US38L0704314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f4ff24a36e51a0aeedbf7c1fc51a54c953518b521ab4849bd38dbab5b465ae. 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/USQY50911214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5d35400288ffe8281e6952aa0b294fbec49b3d7577c1580b9731fb42573d54. 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/USQY50911217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf45d66f93b46c8ac78ada7513ac77840ea36ae49cf35587b273dd635806e58. 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/USQY50911222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c17ffec0581e66674d5c34d27c2591e371a5fbebc6ea4e6d892e5414bbd0f53. 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/USQY50911224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c87f48ffe3ccaa122519916db74e91aea89fe9e78010e13d3cc90fd49246f7. 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/USQY50914108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a4866c8e40106b21b129d8e31c58f1a0748366e35e08154ee1069fd7b28241. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/USQY50914110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb5dabede91a43cdbdaf0db9ef0be6d6efaf53fa26eac56ae0d749f8b77d545. 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/USQY50914114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b86d364e9382f57aff1d85ae7942422b3d7eeb06c0b056f0cc62353bfbd559. 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/USQY50914120.