Marka may refer to: Places Marka (river), Lower Saxony, Germany Marka, Iran, a village in South Khorasan Province Marka, Malawi a town in Nsanje District Marka district, Jordan Marka refugee cam
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fefae6723f79863ad8e7d2e3705e3ecdbf3f69a4c97d66c193ea8d933fcf72. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/934934e4-864a-4b95-8fb1-218b89759d5a.json and https://artists.proofprofile.net/proofs/artist/934934e4-864a-4b95-8fb1-218b89759d5a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31be498bee457ec9554b944700846615c864137a29296c960b526462c33862f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BEW512200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505f8a5fe16d05a17287967383565637f2332e600dfb9d7c5276fca813253749. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BEW512200001.
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 0x4fcb76d0464b2fac7019e2db04016ca6bfbc1cc4d4f9ccb167e3ebafe341a69b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BEW510400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf652c7b52ced068a4daccf7d298198a01092b8831604b100ea6f468f91b13dfd. 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/BEW510400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d20a89ebcecc321a612083675884a6bb1c6ff55230a0df3fd6292bc72f954b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BEW510400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734881fc4126e8e8cf78dabd759b7fe20f58aaa7542c62ea65cf511f3f34d14e. 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/BEW510400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb55102428989ef05aca514e59e0c6e3e4f9e9fac97aa0a4ce21bf87e19fca78. 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/BEW510400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98c15b20621793e3a76f17be09e9beae4d2058917f0c3ae603253fb71a8d844. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BEW510400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6f0850fff7d333e245f09d3476683c0ff26d1a81322efad03fa7c6358e45b3. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BEW510400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae01113ed2c2e5d6205c9db90a88c1615e1baba6e8ab44b9c29749b2ffb79f65. 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/BEW510100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edc561d8f47c19742a379b1bdb95a17829a4c83ddbfb243cd2e7c8202c79ef9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FRZ089804360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126e290c1acf32aeae218540764b098dfc9cef57d1a375b6a711f3e0326cbf85. 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/FRZ089804380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c0e64a7b98bc6b216e2d46f8204e3d2aed2dd044cc59f816d5de09263d1ef5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRZ089804410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051733835193e4cfabe2632d4e7dfcd2de23c0ac05013d8a9f875a6abcf3dca3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRZ089804490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf968cddfc511904051d4c883edabb10dcc2bccc27dc642f62d3feb000ce82c0b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ089804350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d503f268013cda6a0a8efeee52e06a9f3370d3705e03b4ef20426d6089a2429. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FRZ089804480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a76b23a7285f02dc511730c8db702be3245bb7639770831f710bcd9dfd0aaf. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FRZ089804500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5ee7413121e36dcaee039f7d9f90e07ae6756e7be7a2492cf8cae1e37ccc27. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FRZ089804520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9277b056cb166eefcecb818a7fe403eda2293834ad28c64c86191d2da818e62d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRZ089702310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb683ba05b0a437d68179be1067f64046cb7cd1669abc897b2f33fa8d39faa5e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FRZ089502480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeacd40d9086fe5ef24efa78440bb3e8736c515f2c3ef47d3bc4aa5108f6edbe3. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FRZ089501360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd342394378b5db47b808dc17a2310c2f400f45639c2be3285e8aff3537c6af89. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FRZ089502500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5b9b869e9068fbcfbd1e827dfb93ea829ba61d96a112aae2105e59edc44956. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/FRZ089502520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882279c32caca1dc71276e8cd872d056222c2da5b09318c4d91a1a0bd2be359e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FRZ089502540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96f06520352da7d0ea31caaf1b4cbf0de35b6e4a2915516bb0c785c9ad6fcdb. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FRZ089502560.
La dernière tentation des Belges (Bande originale du film)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8eca57f53b094ae840c69f0f9e4cd1a746ce274436091424a423ca152481f6. 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/BEW511900003.