thumb|Orthodox church in the village Sonta () is a village located in the municipality of Apatin, West Bačka District, Vojvodina, Serbia. The village has a population of 3,194 people (2022 census). N
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 0xf3823b529dab8230e8d423b48c7fdd022418564e2556a6056f89241111320f7b. 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/b1f8fed3-e127-4f5c-952e-103c48c5fe21.json and https://artists.proofprofile.net/proofs/artist/b1f8fed3-e127-4f5c-952e-103c48c5fe21.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 0x28f2ed4d8231db4ffd65414b5bb1a9400d35878aca8b79321672e23aaf8f8f13. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCACX1741642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bd187c7506777a45bca5a74faf9e81425cb5e9faa031a09119c715cb2653ef. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/QZ57A1803102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a368a95ee127384f802949799fc29ed01841bc7774cb2edbb77ac37cb7e9d2. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZ57A1803103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a5dc8d24d11eb58927befbc3fbc42085d958a8ccc7635458c01ef8691edc93. 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/QZ57A1803108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c28ff80c5dee9704af357fa51e2a67479a59b64b66815b16b74503bba63f0e. 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/QZ57A1803110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53f789193c35d2f403435c6829d8a2f23b3335a7ddb77ad0ca4e906f1111429. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZ57A1803112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaffa71b838588ac21ac3973b0f90c55879a08566d73ad706d8a0e5757e13bf30. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZ57A1803113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc111a8e73fd49c90f204416889a7cfb85c8f20eeb30ba193f95c7683018d7de. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZ57A1803116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5238a04321c79f0660ba4e417342b64dad14ebfaef8e4d438260d501bbab2d0f. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZ57A1803115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a232f4e61ec571a6cdda46ec0daf40485260f610f49103a984813f9d7da0e2. 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/QZ57A1803117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5895247661451878426e2d82355a0188b3470a6b24dcd60d44f62d441d96db0a. 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/QZ57A1803120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4749ea76c887b851bb39dfe41ae8d9c37d782b3368ee44794a78afa34b935b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZ57A1803122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ba80ccb41d174b4b666df26972b102f9a92139c56319a1410b1ffd9bbc5c2a. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZ57A2106948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95676d2d08fea53b34ec8b9f2cc4cbf3d0d36c1febebbc5ece095642b1786f33. 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/QZ57A2106812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfb6b3b8eefaf7bec263707be583de2b9b2431a55f243f7e5a79bb63ed8c6e0. 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/QZ57A2106820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63eecc164543959c01ba4e2a9c4c29856f449f10c6013d9c76a57cd6eab4370. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZ57A2106830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a6f1c18f5606fd6729496a7cd79049890c5c9cf541df7e65c1ced649662bdb. 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/QZ57A2106852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6f3caf18422e2cd37e079e28a50ee4363914ba3ec497e38891474b1c4babfe. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZ57A2106860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1deca8d1c4d4aab5ab8e70e062cb099a88f29be7bec015e0914fa75725b145. 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/QZ57A2106870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e452aec0a11ce6cc24447d0d4e137883b0f66d3ae815e7915d287bdc15d8bbd. 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/QZ57A2106880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b70f7e31b5557b5114194b6d719e0000c4a9d8705730aafd3b0267fde03174. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZ57A2106890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aca171462ba8e5338169af8f7799ec19630e4d00fc4da0d60bbe332636d4250. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/QZ57A2106938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197baa33fcf52bac7c7414a751277f45736e128e1423d6f7ad6787f712453a1f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CA5KR2414355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0438193e4bca44efafafe84b6b81accec9b4de3593081d06784bf68a0eaf1983. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTGW2400736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4fa5c91029ddee44baa66464959758dc406d23ccf7a2b4aa4430fdb916c64d. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZTGW2400744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1210d035bd06a1b63c431041b0dd5061aff5ec8b237dfd7bf321663eeab3ca58. 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/QZTGW2400741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a082dd42dd88352361ef4664005441bfadd14cc7691921fe7353f37793e379. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZTGW2400742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70a6b8ac7b60aa1ab1f11ad0b937f398271ea6c3a616168682d606acf55c7d5. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZTGW2400743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4fa5c91029ddee44baa66464959758dc406d23ccf7a2b4aa4430fdb916c64d. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/QZTGW2400744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a84013b78a6f8652094194aa3484801dc0a8d882c249b963d6fc5b7b0b2205. 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/QZTGW2400745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623fd6d0bf2aad97e764a7cddb15803966df95e34794fec259358d63f371be7a. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZTGW2400746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088cd6abea448348b40d30f54b2a30aaafa5c02101d83de754e50cc40143fa48. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZTGW2400747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec83b7a616383f55ee66b040ae2db6253cee3eb492becb378b792a3b89a75c6. 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/QZ57A2005778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec83b7a616383f55ee66b040ae2db6253cee3eb492becb378b792a3b89a75c6. 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/QZ57A2005778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4ecf26d4828edc9c7ed9c4b91616b9b8545c4210f1c0928c77ed0d73b0f827. 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/QZ57A1600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840c5bd11d6684fa14c2e975deae020e3bba73786e56b47fdeb11e4b826d7fa6. 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/USLD91719803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066d1d765cd1798ac6be230a5680727187bbc2b422c13f76e31bc628d456a648. 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/QZ5FA1752301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde2bbf10492a0d0db8facb2edb2a3af684d313c77ddc6d20fc33b782632a382. 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/USLD91743752.