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 0x774d9ead7069eab1f95a2ea981e92ebd2759fd8e843771f22845e9cb0d080760. 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/a09a8b9a-27d2-49c1-b777-79e648611f6b.json and https://artists.proofprofile.net/proofs/artist/a09a8b9a-27d2-49c1-b777-79e648611f6b.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 0xf35c2bf13ae01dd3c622e979b74af15fbf48d2a73c983012a8ee72c501e148de. 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/HRB901300291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cf497487807f355f4195eda28a4011c70264bb2bbb0dbfd36d2995874026e5. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/HRB901400906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10076b758b63cbf04c17ee0d9d854d521da42579fcf21afbdbd076403d592b1. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/HRB901400908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6eb3ea3289a6004c6b82e3413112adf3cfb216cc2b047dc69f6854a1003a55. 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/HRA040636741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d9906b6c785f9720ed2c5974df23e7a886344fc17f5111b1fd2540c1825667. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:57:16Z), 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/HRA040646007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57dbe73eafd0baff61f997342152fb44fe5beaad9ca1894f604ee4119e2f70f3. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/HRA040646047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc7ec115dd7cce96218f1df5cce2f1dfe14f8a71ac478467a3d07172f32e596. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/HRA040446056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1082067a7f6857e5234528610722ce590d3a1fa4dbb3695389e464736847d7. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/HRA040646050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75251b5a6005a077d40a7382e698d3fcdaa9ceab2568cb28aad6a29724dc466. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:34:22Z), 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/HRA041062103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86c3c372d959575f4e73a6ec04679a5104296849e7f23fd3c9decf777fbb02f. 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/HRA040753239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f2a40aca31b3b1d9a6f3cf65a90796fe4469dcfb5be1d80f3b646c932f26fa. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:30:54Z), 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/HRA048810377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856d3bf7213f17325d63e7989d500372020c0919fc493e2deba728d495494e9b. 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/HRA049023935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f3ffa4a123439e47c6b2009384fb26a658d92792e0b445d0084e0f597bb976. 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/HRA049633886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7302a76db9c8d966e9112d4c46fd6408a786fdbcf5f14fcdf2be2e0af87f3211. 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/HRA049228010.
Tamburaški Spomenar - 120 Originalnih Hitova
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8d86a7edfe8f01bf92c617bbe0a3a008d59bff7bb3446623af7729652eb02f. 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/HRA040646053.
Srce Podravsko - Mojih Najljepših 45 Pjesama
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af6340dba4bda7b32cfac4731ba1e65fd4127466ca3590dc8583b52546237ba. 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/HRA040646054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee656f472a6e1d6bf3bd7f5af5f4c8390109a7a0f336287c2aa68ff457627a95. 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/HRA040643066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0168ccf4ced4b675e58a330682707272fe238b9a034d4845e99a9b7afb006f9a. 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/HRA040643205.