Contention or contentious may refer to: Contention (telecommunications), a media access method to share a broadcast medium Contention, Oregon, U.S., later known as Twickenham Contention City, Ari
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 0x467897c9be1504a02568313869a9a371039b40f1c3ad37e91c47d9063ef3fb6c. 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/5a6eb85c-c676-43a5-8901-bc68f41a5cf3.json and https://artists.proofprofile.net/proofs/artist/5a6eb85c-c676-43a5-8901-bc68f41a5cf3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
One Scene Unity: A Hardcore Compilation, Vol. 3
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 0x58ed09afbbaf4344fb95e8c0517141e35a55838b339e7caea14ddd2e7321d468. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBMJG2303752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c97062a8634bbf855a381a737efa18c3e4b44f599ebf964a03d6f13e4aafc42. 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/GBMJG2303753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5a437f56e5a43c0b3cced1ceb5a748e9c7e0a85797fcf16180b269304e2909. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/GBMJG2303754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae02aaaf3364445059471f9c503004064519a0cab1e82627d3f57664b757c35. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBMJG2303755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2616baab16a7dbe1db996e13ba3f91d1e67ae6717429e4b09ec60fd47be45a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBMJG2303756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28657f1bf26c0e452029af43131e79d332e47a32f2bf2cba773d64713185fd3f. 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/GBMJG2303757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084caa338838f8e7478d769183697c6e49e0a5069ef02adc5d03796ffcefab2b. 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/GBMJG2303758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de248a65651c5b228e9f677afe5de45b86afc9c2504af89059cd464ba79109b. 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/GBMJG2303759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81aba4935515e4b420d720388bddd7bfc2a2bff8ca9069456646aca7ad9976b5. 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/GBMJG2303760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d26f5f0dc7b3e8afe578b8e4f0cee409e178f7c481e3fbac0bbd4ce8b8737a. 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/GBMJG2303761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80026999317789a3539597df8d3582c1f7cf9e5886098f6e9c92ab9d3d52d0f8. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBMJG2303762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400e4c07fe0c4c3c271b4863cd33b5247cafeac3c7d36b73dde6f243b9d03622. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBMJG2303763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64c95f775624e5e5891cf44d501b8ac2952fab6abb923ad0c088e801a9995e7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBMJG2303764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180d9a771b1199d77d2d42c29679a34abc934d53b019c416430a93c7351d13c2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBMJG2303766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0972e3547c716b88c58fe93b7214f6f70e4e123565547d8fb3b8ff82c41d13b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBMJG2303767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2a2af5de6548fa042ebe2cd600364053bb7bb3642516a37954c6b35a943955. 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/GBMJG2303768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532e9413729699e60bc6699ed1188c3ad473fcbc8439339015a45a4e06bd9b0b. 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/QZQAY2460096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08f5ad36bc58c923f5ac138855392376c56f938c721d9ae7f9ada2d61889726. 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/QZQAY2443324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4136f1d29800da68bc7b7a55bc2f0a32ae2265ad3c6f82108e93ee927e3a3381. 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/QZQAY2465674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b98a45b68cf7888165d837eee3ac7fb2295a4861b23e7c1fccfcc8b5867020. 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/QZQAY2478898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabed44d8dba700230d519dee71751841311335e35d6f7d8eae250774674d93e. 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/QZQAY2437978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45fa6a5b76c000b78d8a29956df684ea54579e94627c52541b12e2093802ce0. 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/QZQAY2402993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95e7b9df1ba28323fb3dcc5f3cae6217f0e96a3bdfaacfcd094b35b3eabcdec. 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/QZQAY2437200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a010cb658987f3956311aa285383c074383484b68bf10076f47849089bc57df. 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/QZQAY2452134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25f3a319ff8a8ae32ea9bae7dd423eea5abb05dbd47217d5ae0ad065e5f24f4. 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/QZQAY2429964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfb351198325531f7bcb77cc82379d30e6c7a41aa3d69968f03cbabef52df02. 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/QZQAY2431708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4136f1d29800da68bc7b7a55bc2f0a32ae2265ad3c6f82108e93ee927e3a3381. 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/QZQAY2465674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25f3a319ff8a8ae32ea9bae7dd423eea5abb05dbd47217d5ae0ad065e5f24f4. 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/QZQAY2429964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25f3a319ff8a8ae32ea9bae7dd423eea5abb05dbd47217d5ae0ad065e5f24f4. 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/QZQAY2429964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c88afb5f6e3809d04b947b1888c783ed8c5d434d594b6d6cf8562a4471d584. 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/QZK6L2257688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579377d16b33eb6ed8a23c0180e0eff2333dcd8916ab51bdf4c330009798db17. 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/QZK6L2257689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41bc9e9a2eb8edfee172e8f677093f394669f2247ce26086a68e5718e549644. 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/QZK6L2257690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8a8945eaf8341cf21cbd2092a8a5ae6f0634922183296c76a96a27f6bdf399. 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/QZK6L2257691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9834faa3e4d36a6b519c2a0a3fe71dde14527e0c2fe8ea41943fcdf273dcf3bf. 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/QZK6G2165416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcab32e69eeb2bbe206ca52b52285b85752b349b403567cd3c11a36a7c983f07. 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/QZK6G2165417.
Legalize Everything and Let God Sort Them Out
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5879c54ec103743b75b7c5d7ae40c35b65c1f2e5426d0ba8f69012b77a6f98. 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/QZK6G2165418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15990df340f5d587e32596133c3af3d5210a8ba94e4bd5c2d48f9f300aeb17cd. 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/QZK6G2165419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6df19a8f794e8e905316a12a45419a0775e5f8b76e6a7ad9fac70c43bb6738. 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/QZK6G2165420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa66fe8c7938f69934d4b45bc4f27b05b947f83ead4b971793cbf895f1612a3b. 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/QZK6Q1911603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa374f4cf30a54aa43728b448e3e8b47295035f38387304b91b39cafae0c8d7ec. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZK6Q1911604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b581e7ae633c4f6b5b71ecea3dfb14a4cdf971c86e6b4e2eeaf7fb874b2109. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZK6Q1911605.