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 0x92c4de601c677af4d787ca44f01061838f638cad070a488033d2cf3bbbdc3a5e. 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/8f142700-f9fa-4d7e-9605-552c7e05e282.json and https://artists.proofprofile.net/proofs/artist/8f142700-f9fa-4d7e-9605-552c7e05e282.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 0x698b06f8298b2f1c0c336f0255ce5ef5c461870fc4ca5fbb777f7ca1761ceaae. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/PLD990203904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cbe486683b8d8a8be636a658d07e3cd2e6f09fd51a5d6cdb32ecf02928f692. Chain 2 (Bitcoin): anchored in block 957702 (2026-07-12T12:25:41Z), 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/PLD990203907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d01c7afda31dfe7d7c7789a3e6fb567e9c90fb01fd4f8cc520f14a3a8a51005. 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/PLD990203915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979735bf74ce2034e066fb196240f12f7c7d976eda7d97b9d0d5fd4ebf62f2ab. 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/PLD990203920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e2878e38ddfa0b083803455bde203fb157a48b519c7463073efd7045a25bd9. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/PLD990203922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81230b5e241301ffc610edada04a7f9eabb7ed76b26331d8a8945ca81387a87d. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/PLB170700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6574a4aec11f2787c02e091f26b92884aad18e8ecbe0c3937f10a435d324eb0. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/PLB171100181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9b2fe33ef4850747e542559e533aeddf4e1e27eb83a925fb3321d03eb86eb9. 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/PLD991214103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20737748532eb3321df56d9a4351bbc05b5e5cc4305185ba30c8d194fdf4789c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/PLD991214113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41374e56cd7282acf87ce502ff0ac7345da3205d9a177e7b9c73447902a6c2a8. 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/PLB171300318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e4791d0cf9479ccbd28fc528621507ea7eb59fa00c3f02f0b774bfd5b94f59. 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/PLB171300319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b50d5da4cc5a68eb9235387b4c29c448741c26544b2166d51bf6a13e9067a4c. 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/PLB171300320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5a2c5084574b55177684ff7b0a072c5dc37a6383c4d40ee7b2bfa8bf59d34a. 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/PLB171300327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194a679eeb8e38503a9276a46d636d0eea377236286be0afe3767b942bbc1971. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/PLB171300328.
Martwe liście (Les feuilles mortes) - Live
Wojciech Młynarski Zaśpiewany (Dobre Piosenki)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cccdf380bdf9ee058c06e0413259459414712bcf7c5de9664aff256246e3497. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/PLB171200923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b88dd83a30f1189ca70dac41afdc2a923bcf0249a7d281d2c0ed580ba30509. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/PLB821900127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e4ed7dccd8f1af21d7748712f485f3e129004e298fbbbbd9b530e41bb40a0f. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/PLB821900128.
Bardowie i poeci - Andrzej Poniedzielski
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4a0e4ab85df6cdd098b5f1c1250285a896add78fd82d51a470c2437f29f390. 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/PLB171200931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf034e4043b6bc81a19a3f51c042baa10defeb863f2e77ce320b2e29e27d7e7. 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/PLB171200912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe866bdb196bc99e505225a98b3b7546dfa82feeefa5041b50c1df4fa75d45acc. 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/PLB171200927.