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 0x7bc6aced7a4bf65f31ff79f871ad4fa3106a20ad55c450482a7965939f8e421b. 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/0e29a03e-0d29-4a9f-b987-b36ef310edab.json and https://artists.proofprofile.net/proofs/artist/0e29a03e-0d29-4a9f-b987-b36ef310edab.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 0xb2acc527512114fc82fef84fcdc17a11343d0ed7c131f506b0f366efcdfc8606. 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/PLH751300356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e878ab36e2391445cb7ce68987438dab3faf14d3ce914a917e96a399e5196be. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/PLH751400389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1eba39d836c36f43f3e117a926d8922a773e934685dd712106a6fb2a2be2d30. 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/PLH751400390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531e4729b809905e447d209c935e6c5adba9d72ac5a9de207942d77bd37ecfbd. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/PLH751600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c8a45bb3ddc6bc581c70c4d1dcec695630bb3863f2d62a0a5d13d9177ab61e3. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/PLH751700046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8b52df7297e05b860e64f33a078a65af52ad79eea0179fdc6cce5010e3050a. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/PLH751800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee9303b39d36a34485829146a7a22d1710e472ff3fc7e56cb9aec3274d7022f. 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/PLH751800107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8f094d869c6020fabecb86791e25b487a0175ca05b0a0d6832bbac0d29169b. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/PLH751800111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde43a7eef2057a78ba0cb423fea36e814be3b27679802d11a789d06be9c3e98b. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/PLH751900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87f868aa1f53e9d8eee982de0ef4a4f36864c03d2e0c8c85a018d146e05c620. 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/PLH752400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff214dce9d91c8381e7eaa62f24e51f0cdb8ef3b0b27196278ffc0d5567b6405. 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/PLH751300286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2c63cda616f0a7b97e25cb737f322f7b134c1af504d0c1949d12e354ef53bc. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/PLH751300355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a43139877ee6e2129f6d0dce0ac4caf15e4a4bf653497251be462db8e843af. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLH751300354.
Składanka do auta - największe hity Disco Polo 2024
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87f868aa1f53e9d8eee982de0ef4a4f36864c03d2e0c8c85a018d146e05c620. 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/PLH752400021.
Sylwester 2021: Największe hity Disco Polo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2acc527512114fc82fef84fcdc17a11343d0ed7c131f506b0f366efcdfc8606. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PLH751300356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ab53bb40505dfa253420e11cc6dc5f31523cc4a75534e85bdaae7bb850142e. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/PLH751800108.
Składanka na Sylwestra - Największe Hity Disco Polo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d993aa4a458e508bc7327a64ee85890e6b4562483eb019f2c137d07117f05e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/PLH751800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61749e25168edc87cfcd644044aae55614a151319b2f7e3fb26c07b386942f9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR8GV2425350.