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 0x23d189ca44dad84a368ef8abcf72ff3fb30a335708810b5ae0bada0e5170ef80. 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/4ff9e58a-14a7-4e48-93dc-e5b11115512f.json and https://artists.proofprofile.net/proofs/artist/4ff9e58a-14a7-4e48-93dc-e5b11115512f.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 0x2b6358ef081ea39b1407907111ab0c53a0cd5cc905321126d6170ff589b0962b. 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/NLS241800350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724169e8de4629c90ea6d45d67c9eb09bc5777f03dd0b2d4b55eee3f4c37cb75. 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/NLS241800624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcd4f66ed90704e19df97e059413cb1a31719e9ed938ddd24fe480c09e6d0e4. 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/NLS242000123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abca6444911b8f5d5847a7930a33cfa22d2603d78928f7453d4ad0b2cb898f6. 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/NLS242000124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e930032e8f5599e41dd4ab8b62926ceca0a1ee906c6edbb601a837a370f7772. 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/NLS242000125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f05e3ce767f8b92dd90d852c064ae02a052f2ffb7d94fc3ac3b56a77303e32. 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/NLS242000126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7100c1ceb6e8a059f8bf0696d853456473f927069506c1ef66018e0a3754ee2a. 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/NLS242000127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f596af9cea687c7d032008ed996e010d347c34272d68a80dbb08e5b2596726. 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/NLS242000128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0d5807822c055843fd46a9532963dc0d592a982104e35f3fdd8d714c38f69a. 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/NLS242000129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6358ef081ea39b1407907111ab0c53a0cd5cc905321126d6170ff589b0962b. 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/NLS241800350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e77ed5da96af9901c29d6c92e14afd07118ad50c4ae355189d999b687fc01c6. 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/NLS242000130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e948a5bfff409e115b001617b7d3dde3bf3b6bde1f143efac5551991a4b8f2. 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/NLS242000131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14951e01766c9c779b245e8c0470328d35ce3d9ac3dc92fae46e43f33b63a52b. 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/NLS242000132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724169e8de4629c90ea6d45d67c9eb09bc5777f03dd0b2d4b55eee3f4c37cb75. 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/NLS241800624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8171dd399eca596300e348b9a8d2696dd15f3fcea128f6383ddfd033e53ed2f. 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/NLS242000133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a386df960521ed72d96d638780213d6e9981a231a184533843f1047adc4c71e. 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/NLS242000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda8642408c38525f2fc49078104f93cb102f7ad7cb6009d559430c360e1b2e6. 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/NLS242000360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f729dcaad92f9c687ce621926566bc56f04731e4182781a6b4d7c607935f55. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLS241800285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd68acd68bcfd67df6c3b1c7ce3b09ff82fc6127ba2f05b772d922316abec59f. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLS242000361.
Spraakmakers Vol. 2 - Urban & Hiphop Hits In The Mix (Mixed By DJ Irwan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc218cf1a725b83103f77cb5055aad5a212d2691d1273741b7ba01a1df250822e. 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/NLS241800189.